Here's a few from Buzzfeed. See the whole list HERE HERE HERE
1. Aerosmith’s “I Don’t Want to Miss a Thing” was originally written for Celine Dion.
2. The song “Torn” by Natalie Imbruglia is actually a cover. The original is by Ednaswap.
3. “Tainted Love” is also a cover. The original is by Gloria Jones and came out in 1964.
4. ALSO “Girls Just Wanna Have Fun” is a cover of some dude. The original is by a guy named Robert Hazard.
5. One last one: “I Love Rock & Roll” is a cover. It was originally by The Arrows, not Joan Jett.
6. The song “Sweet Child of Mine” was written in five minutes.