I'm Speechless! Crystal Bowersox performs one of her favorite songs.

American Idol's Crystal Bowersox visits The Tonight Show with Jay Leno, and gives one of the best performances by any Idol contestant, EVER! Crystal belts out a soulful rendition of 4 Non Blondes "What's Up." Linda Perry - Are you listening?? I can only imagine the incredible music that would come out of a Bowersox/Perry collaboration. Both women put their whole being, their soul, into every song they sing. (If you're not familiar with Linda Perry, click "4 Non Blondes" above and get that CD NOW! "Once best known as the lead singer and primary songwriter of 4 Non Blondes, Perry has founded two record labels and has become a major songwriter and producer responsible for hit songs by a number of successful female singers such as Christina Aguilera (who had a #1 hit with Perry's song "Beautiful"), Gwen Stefani ("What You Waiting For" from her album Love Angel Music Baby) and Pink (who had a #1 hit with "Get the Party Started", written by Perry). Perry has also contributed heavily to albums by Courtney Love and Kelly Osbourne as well as signing and distributing James Blunt in the United States.")

Just yesterday, Crystal was asked "What is your favorite song to sing" during the Father's Day 'Live Chat," where Crystal, Lee DeWyze, Casey James and Didi Benami answered fans' questions submitted via Twitter. Her answer, ""What's Up" by 4 Non Blondes. It's a fun one. Lot of yelling." Crystal looked like she was having a great time performing "What's Up" with bandleader Ricky Minor and his band. Crystal owned the song and the stage, and it was obvious from the gleam in Crystal's eyes that this is what she was meant to do. Crystal does not perform because it is a job, she performs because it is sheer joy to do so.

Ricky left Idol after the Season 9 finale to become the house band for Jay Leno. Crystal tweeted, "Reunite with Ricky Minor and the band!!!! Rehearsals today for the tonight show with Jay Leno. ;)...Reunited and it feels so gooood." Later, after taping the show, Crystal tweeted "... Had an amazing time with Ricky + band, Dakota fanning and Jay!! Thanks to everyone at the tonight show!"