Simon Cowell's leaving "American Idol" tonight, so they run some clips of his funniest moments, with the other judges doing mock tributes to him -- including Paula Abdul.

It all just reminds us how much more fun he seemed to have when she was around. It's really been a slog this season.

Siobhan Magnus and Aaron Kelly then sing "How Deep Is Your Love," which is a great pairing. They are  two of the best, pure voices this year. Then Barry and Robin Gibb of the Bee Gees come out -- talk about a distinctive tone!

The quartet works surprisingly well, everyone harmonizes well, and it's not a mush of sound. It's totally enjoyable. One of the best celebrity pairings we've had.

PHOTOS: "American Idol" final round | Lee, Crystal and Casey go home | "Idol" top 12 party with "Glee" stars

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