Originally written for Prince’s side project, The Family, this heartrending song—with its telltale numerics and alphabetic words in the title, a sure sign of a Prince composition—became a worldwide hit for the Irish singer in 1990, topping the pop charts in 17 different countries. She struggled with the fame the song brought her. When “Nothing Compares 2 U” earned a Grammy for Best Alternative Performance, she refused to appear on the awards show. In 2015 she declared that she would no longer be performing the song—at which point nobody seemed to care anymore. Prince released a live version of the song with Rosie Gaines on his 1993 album, Hits.