"I Don't Know What It Is" is a song written and performed by Canadian-American singer-songwriter Rufus Wainwright. It was the first single from Wainwright's third studio album "Want One" and was released in a slim-line jewel case format on July 26, 2004.

Based on the paragraph above can we conclude that "I Don't Know What It Is was a hit song"?
It's impossible to say