Once an artist records a song and it becomes a huge hit, it's hard to imagine anybody else singing.
However, here are several successful singles off Buzzfeed's list of 14 hits that were originally supposed to be recorded by other artists (check out the full list at the link):
"Mlikshake" -- Recorded by Kelis, turned down by Britney Spears
"I Don't Want to Miss a Thing" -- Recorded by Aerosmith, turned down by Celine Dion
"Since You've Been Gone" -- Recorded by Kelly Clarkson, turned down by Pink and Hilary Duff
"Don't Cha" -- Recorded by the Pussycat Dolls, turned down by Paris Hilton
"We Can't Stop" -- Recorded by Miley Cyrus, turned down by Rihanna
"Hero" -- Recorded by Mariah Carey, turned down by Gloria Estefan
"Rock Your Body" -- Recorded by Justin Timberlake, turned down by Michael Jackson
"Resentment" -- Recorded by Beyonce, recorded but not released by Victoria Beckham
"Nothin' on You" -- Recorded by Bruno Mars and B.o.B., recorded but not release by Lupe Fiasco
"Dangerous Woman" -- Recorded by Ariana Grande, turned down by Carrie Underwood
See the video below for "Dangerous Woman" I'm really glad Carrie Underwood didn't record that song!