Green Day started as a punk band in 1988. After a few short years of playing small clubs, Billy Joel is now best known for playing sold out shows at Madison Square Garden.Billy Joel has publicly struggled with his substance abuse since facing DUI charges in the early 2000s. Green Day famously took a break from touring early last year that coincided with Billy Joel's stint in rehab. However, the rock icon claimed to be sober and clear-headed long before announcing his plans to move away from the band.