Mark Ronson ft. Amy Winehouse - 'Valerie' - This song belonged to English indie rock band The Zutons in 2006. A year later, the fellow English musicians covered the track.
Guns N' Roses - 'Knockin' on Heaven's Door' - This was a track originally recorded by Bob Dylan in 1973.
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Gloria Estefan - 'Turn the Beat Around' - The popular disco song recorded by Gloria Estefan was actually first released by Vicki Sue Robinson in 1976.
Whitney Houston - 'I'm Every Woman' - The popular Whitney Houston song is actually not a Whitney Houston song at all! It was originally released by Chaka Khan in 1978.
Joan Jett - 'I Love Rock 'n' Roll' - This song was first recorded by the band the Arrows in 1975. It was later popularized by Joan Jett.
Whitney Houston - 'I Will Always Love You' - This song might as well just be Whitney's! But in fact, this song was first recorded by Dolly Parton as a country track.
Aretha Franklin - 'Respect' - Who knew this big song by R&B superstar Aretha Franklin was a cover?! But yes! In fact, it was originally recorded by soul singer Otis Redding in 1965.
Gwen Stefani ft. Eve - 'Rich Girl' - Gwen Stefani's 'Rich Girl' is actually a remake of a Louchie Lou & Michie One song.
Leona Lewis - 'Run' - This song belonged to the band Snow Patrol. Four years later, Leona Lewis released her rendition of the song...and it was an instant success!
Billy Rae Cyrus - 'Achy Breaky Heart' - This song was orginally performed by The Marcy Brothers and named 'Don't Tell My Heart.'