Most People Can't Identify The Original Songs That These '00s Hits Sampled (Even Though They've Heard Them A Zillion Times)

Jack Harlow sampled "Glamorous" by Fergie on "First Class," but she sampled another past hit on "Glamorous" first.

When one song "samples" another song, it basically means that the new song uses part of the original song in its production. As a recent example, Jack Harlow's "First Class" sampled Fergie's "Glamorous."

Of course, it's not a new thing — and you've probably heard countless samples over the years without even realizing it. Can you identify the original songs that these '00s hits sampled?