An essential track, however, is notably absent.

Representatives for Prince’s estate did not immediately return EW’s request for comment.

1 on Billboard’s Hot 100.

Sinéad O’Connor appears in Nothing Compares by Kathryn Ferguson, an official selection of the World Cinema: Documentary Competition at the 2022 Sundance Film Festival.

Sinéad O’Connor in her Sundance documentary ‘Nothing Compares’.Courtesy of Sundance Institute/Andrew Catlin

Despite the song’s success, the two singers were not close.

The documentary’s premiere comes a few weeks after O’Connor shared that her son Shanedied by suicide.

“May he rest in peace and may no one follow his example.”