21. Steely Dan Wikipedia / Via en.wikipedia.org Donald Fagen has always been the lead singer of the popular '70s jazz rock band, which he co-founded with guitarist Walter Becker. Yet people may not know that Steely Dan had another second lead vocalist, David Palmer, who appeared on the group's debut Can't Buy a Thrill from 1972. His voice can be heard on the melancholy "Dirty Work" and "Brooklyn (Owes the Charmer Under Me)." However, he had already left Steely Dan prior to the follow-up, 1973's Countdown to Ecstasy, although he did provide backing vocals on that record. The Dan went on to a Rock and Roll Hall of Fame career with such classic albums as Pretzel Logic and Aja; Palmer, who also co-wrote Carole King's 1974 hit song "Jazzman," is now a professional photographer. 20. Journey Wikipedia / Via en.wikipedia.org Before it became America's favorite arena rock band during the '70s and 80s, Journey began as a five-piece progressive rock group whose two members, Greg Rolie and Neil Schon paid their previous musical dues in Santana. They appeared on Journey's 1975 self-titled debut along with rhythm guitarist George Tickner, who also co-wrote two songs for that record. Shortly after, he departed from the band to attend medical school, leaving Journey as a quartet for its next two albums before Steve Perry joined. Tickner resurfaced in the public eye when he and the other past and present members of Journey received their star on the Hollywood Walk of Fame in 2005. 19. Roxy Music Wikipedia / Via en.wikipedia.org Long before Spinal Tap became famous for its long line of drummers who died under weird circumstances, the great '70s British art rock band Roxy Music had different bass players all throughout its history. The group was founded by singer Bryan Ferry and bassist Graham Simpson in 1971 and released its remarkable self-titled debut a year latter. But Simpson didn't stick around for Roxy's second album For Your Pleasure ; he struggled with depression following the death of his mother. Simpson traveled to parts of the world and studied different cultures before he passed away in 2012. "I liked Graham, and Roxy Music would never have happened without him," Ferry once said. 18. Electric Light Orchestra Wikipedia / Via en.wikipedia.org Everybody knows that Jeff Lynne is Electric Light Orchestra as the band's singer, multi-instrumentalist, songwriter and producer. But the British classical-influenced rock group began with him, Roy Wood and Bev Bevan after the dissolution of their previous band, the Move. Both Lynne and Wood shared the vocal, songwriting and production responsibilities on the first ELO album from 1971, the very experimental-sounding No Answer. But like having too many cooks in the recording studio, the partnership didn't last, and Wood left ELO to start his own group Wizzard, which is known for its holiday hit "I Wish It Could Be Christmas Every Day." His replacement was keyboardist Richard Tandy, who became Lynne's right-hand man throughout ELO's hit-making run during the '70s and early '80s. 17. The Velvet Underground Wikipedia / Via en.wikipedia.org Considered one of the most important and influential works in rock, The Velvet Underground and Nico (1967) was the only Velvet Underground album to feature the German model/actress Nico, who memorably sang lead on three songs: "Femme Fatale," "I'll Be Your Mirror" and "All Tomorrow's Parties." Her presence in the band was due to the encouragement of the group's producer at the time, Andy Warhol. But her days in the band were numbered, which was compounded when she showed up late for a VU gig at the Boston Tea Party, according to Rolling Stone editor David Fricke's liner notes on the 1995 Peel Slowly and See box set; VU recorded White Light/White Heat without her. Meanwhile, Nico had began an adventurous, if sporadic, musical solo career with her 1967 album Chelsea Girl, which featured VU's Lou Reed and John Cale. She died in 1988 following a bicycle accident. 16. Jethro Tull Wikipedia / Via en.wikipedia.org British progressive rock band Jethro Tull is synonymous with its leader: singer and flautist Ian Anderson. But a few years before it hit paydirt with 1971's Aqualung album, Tull began as blues-influenced band on 1968's This Was, featuring Anderson and guitarist Mick Abrahams. However, disagreement over the band's musical direction away from the blues led to Abrahams forming his own blues-oriented group Bloodwyn Pig. Guitarist Martin Barre succeeded him and remained with Tull for the next four decades. There is still friendship, however, between Anderson and Abrahams as Anderson appeared at a Bloodwyn Pig gig in the early '90s. 15. Big Star Wikipedia / Via en.wikipedia.org The name of the legendary Memphis-based power pop group is ironic given that Big Star never achieved commercial success with its first three albums, which are now regarded as classics. The band recorded #1 Record (1972), featuring both singer-songwriters Alex Chilton and Chris Bell. Compounded by that record's lack of commercial success and differences with Chilton led Bell to quit the group. Big Star now under Chilton was reduced to a trio and made two more power pop gems, Radio City and Third/Sister Lovers before breaking up (Chilton and drummer Jody Stephens resurrected Big Star in 1993). Meanwhile, Bell recorded as a solo artist; he died in a car crash in 1978 at the age of 27. 14. N.W.A. Wikipedia / Via en.wikipedia.org The preeminent gangsta/West Coast rap group, N.W.A. had a killer lineup that included Dr. Dre, Ice Cube, and the late Eazy-E. The group released its debut, 1988's Straight Outta Compton, yielding memorable yet controversial songs in the title track, "F--- Tha Police," "Gangsta Gangsta" and "Express Yourself." However, Ice Cube left the collective in 1989 over royalties and embarked on to a successful solo career with hit albums such as Amerikka's Most Wanted and Death Certificate. N.W.A. soldiered on without him but broke up after the sophomore release Effil4zaggin and the departure of Dr. Dre. In 2014, N.W.A was nominated for induction into the Rock and Roll Hall of Fame. 13. Blondie Wikipedia / Via en.wikipedia.org At the time it released its self-titled debut album in 1976, the New York punk/New Wave band Blondie was a five-piece outfit that included bassist Gary Valentine. Though Blondie was the only album he appeared on, Valentine wrote two of the band's popular early songs, including "X Offender" and "I'm Always Touched By Your Presence Dear," the latter ending up on Blondie's second album Plastic Letters. By that time, Valentine had already left the group and was replaced by Nigel Harrison. Blondie went on to superstar status with the Parallel Lines album; Valentine formed his own band the Know and is now a writer under his born name Gary Lachman. He and the other past and present members of Blondie were inducted into the Rock and Roll Hall of Fame in 2006. 12. Blood, Sweat and Tears Wikipedia / Via en.wikipedia.org The jazz rock band Blood, Sweat and Tears was formed in 1967 by keyboardist Al Kooper, best known for his work with Bob Dylan on "Like a Rolling Stone." Under his leadership, the group recorded and released the modestly successful Child Is Father to the Man in 1968. But then dissension within the band led to the departure of Kooper and the arrival of Canadian singer David Clayton Thomas. This new edition of BST then released its self-titled second album, which yielded three hit singles and won a Grammy for Album of the Year. Meanwhile, Kooper has maintained a consistent career that included collaborating with Stephen Stills and Mike Bloomfield on the Super Session record and producing Lynyrd Skynyrd's debut album. 11. King Crimson Wikipedia / Via upload.wikimedia.org The quintessential British progressive rock band led by guitarist Robert Fripp had famously undergone so many lineup changes in the last 45 years. Its stunning debut, 1969's In the Court of the Crimson King, featured multi-instrumentalist Ian McDonald, whose Mellotron playing was an integral part of the band's early sound. However, he and drummer Michael Giles left King Crimson that same year to form their own band McDonald and Giles. While that group didn't pan out, McDonald would find success the second time around as a founding member of '70s rock band Foreigner (he stuck around after that band's first album). Crimson carried on with a whole variety of players with Fripp as the only original member. A new edition of the band recently reformed and toured this year. 10. Red Hot Chili Peppers Wikipedia / Via en.wikipedia.org Like Roxy Music's issue with bass players, the Red Hot Chili Peppers have gone through their share of many guitarists: among them Dave Navarro, John Frusciante, the late Hillel Slovak, Arik Marshall, and currently Josh Klinghoffer. On the band's self-titled first album from 30 years ago, Jack Sherman was the band's axe player. He was later replaced by Slovak, who was actually the band's founding guitarist, for RHCP's second album Freaky Styley; after several years and the death of Slovak, the band achieved huge success beginning with the breakthrough 1991 album Blood Sugar Sex Magik. Meanwhile, Sherman went on to play on albums for George Clinton, Bob Dylan, and Tonio K; in a 2012 Billboard interview, Sherman criticized the Rock and Roll Hall of Fame for not including him as part of RHCP's induction. 9. The Cure Wikipedia / Via en.wikipedia.org The Cure has gone through so many personnel changes in the last 35 years, with guitarist/singer Robert Smith being the only original member during all of them. The beloved post-punk group started out as a trio with Smith, drummer Lol Tolhurst, and bassist Michael Dempsey, all of whom recorded the 1979 debut Three Imaginary Boys, which is notable in that Dempsey sang lead on a cover of Jimi Hendrix's "Foxy Lady." That lineup didn't last long when Dempsey joined another band called Associates. He was replaced by Simon Gallup, who has remained in the Cure ever since and just as long as Robert Smith himself. 8. Depeche Mode Wikipedia / Via en.wikipedia.org The hugely popular synthpop group from Basildon, England is still going on strong nearly 35 years later while some of its peers from the '80s have since faded. On Depeche Mode's first album, 1981's Speak and Spell, the majority of the songs were composed by original member Vince Clarke, including one of the band's most enduring hits "Just Can't Get Enough." When Clarke left, Martin Gore assumed Depeche's songwriting duties full-time and has continued to do so ever since. Clarke, however, didn't fade into obscurity as Depeche became huge: he went on to form Yaz and then Erasure, both successful synthpop acts in their own right. 7. The Moody Blues Wikipedia / Via en.wikipedia.org Birmingham, England's Moody Blues began as a pop group and had a big hit with "Go Now," from their 1965 debut The Magnificent Moodies. Then the Moodies were dealt a blow when both singer/guitarist Denny Laine and bassist Clint Warwick left the band in 1966. Enter their replacements Justin Hayward and John Lodge, and the Moody Blues were transformed into a hugely successful progressive rock band that recorded the classic Days of Future Passed in 1967. Those two 'newbies' are still with the band over 45 years later. Laine's music career didn't end there after leaving the Moodies as he joined a band called Wings in the early '70s fronted by none other than Paul McCartney. 6. Green Day Wikipedia / Via en.wikipedia.org Tre Cool has been the longtime drummer for Green Day since the early '90s. But despite being with the band for over 20 years and playing on hit albums such as Dookie and American Idiot, Cool wasn't on Green Day's debut full-length studio album 39/Smooth -- rather it was John Kiffmeyer. He left the band to attend college and later played with another group called the N'er Do Wells. According to Marc Spitz's 2007 book Nobody Likes You: Inside the Turbulent Life, Times and Music of Green Day, Kiffmeyer is reportedly married and works in film. Meanwhile, Green Day was recently nominated for induction into the 2015 Rock and Roll Hall of Fame. 5. Jefferson Airplane Wikipedia / Via en.wikipedia.org On any list of iconic female singers in rock, Grace Slick of Jefferson Airplane ranks right up there. Yet she wasn't an original member of the popular '60s San Francisco band and didn't appear on its 1966 debut album Jefferson Airplane Takes Off – that honor belongs to Signe Toly Anderson. Following the release of the album, Anderson left the Airplane as she became the mother of a daughter. Also exiting the band after Takes Off was drummer Skip Spence, who later founded Moby Grape and recorded the classic cult solo album Oar. Spencer Dryden took over Spence's spot, and he and Slick appeared on the band's hit album Surrealistic Pillow. 4. The Clash Wikipedia / Via en.wikipedia.org On the Clash's brilliant self-titled 1977 first album, Terry Chimes was the man in the drummer's seat. But following that album's release, Chimes exited the punk band to be replaced by Topper Headon for the sophomore effort Give'Em Enough Rope, establishing the definitive classic Clash lineup. When Headon parted from the band due to drug issues around the time of 1982's Combat Rock album, Chimes rejoined for the band's tours before leaving once again; he went on to play with Johnny Thunders and Black Sabbath. Chimes later left music behind to become an acupuncturist and chiropractor. He and the Clash were inducted into the Rock and Roll of Hall of Fame in 2003. 3. Rush Wikipedia / Via en.wikipedia.org Can anyone imagine Rush without the powerful and signature drumming of Neil Peart? Actually, it did happen – Peart was not a founding member of the legendary Canadian progressive rock band. On the band's 1974 debut, whose sound was more in the vein of Led Zeppelin and Cream, John Rutsey played the drums. According to the 2010 documentary Beyond the Lighted Stage, Rutsey left the band due to health issues; Peart joined Rush as its drummer and lyricist on the second album Fly By Night, released the following year. Rutsey died in 2008 at age 55. 2. Nirvana Subpop / Via subpop.com When Nirvana broke through with Nevermind in 1991, most people at the time probably assumed that the record was the band's debut. However, the band's first album Bleach was released two years earlier – and its drummer for that work was not Dave Grohl, but rather Chad Channing. He left the group following the record and continued to pursue music with bands East of the Equator and Before Cars. Meanwhile, Nirvana changed rock in the '90s forever; the band was inducted into the Rock and Roll Hall of Fame earlier this year. 1. Guns N’ Roses Wikipedia / Via en.wikipedia.org Most fans would agree that the first line-up of Guns N' Roses remains the definitive one – which included singer Axl Rose, guitarists Slash and Izzy Stradlin, bassist Duff McKagen, and drummer Steven Adler, all of whom played on the blockbuster 1987 full-length debut album Appetite for Destruction. But in the volatile world of the Gunners, Adler became the odd man out when he was fired over his drug use; Matt Sorum took over the drum chair and appeared on the group's follow-up releases Use Your Illusion I and Use Your Illusion II in 1991. Since leaving the band, Adler experienced tough times that included substance abuse issues ; in an interview with Rolling Stone, Adler said that from 2008 he has maintained his sobriety. He wrote a 2011 memoir and recorded an album Back from the Dead with his band Adler. As for the current version of Guns N' Roses, Axl Rose, of course, is the only original member left from the Appetite lineup.