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Source: WENN

John Legend – Everything is Everything

John Legend has a bunch of surprising features in his discography, including Alicia Keys’ “You Don’t Know My Name” and Al Green’s “Stay With Me.” But one that really shocked us was his background contribution to Lauryn Hill’s “Everything is Everything,” which didn’t feature his vocals but actually his piano playing.

Source: WENN.com

Ke$ha – Right Round

This one may have been more obvious to some than others, but in 2009, Ke$ha (who was still unknown) was featured on Flo Rida’s track “Right Round.” But although her voice played a large role in the production, she was uncredited in the American version, received no payment for her contribution, and opted out of appearing in the video.