Yes, Sinead O'Connor had a worldwide hit when she released Nothing Compares 2 U in 1990 as the second single from her second album - I Do Not Want What I Haven't Got ... 

But did you know the song was written and composed by Prince for one of his side projects - The Family?  Maybe you didn't, because Prince's version was never released - until now ... check out the newly unearthed recording of the Purple One [RIP] perforoming the song  from 1984 - along with some sweet rehersal footage of Prince and The Revolution!