BTDT
Before the gig, the band leader chats up the singer.
"Tonight, when we do Night and Day," he tells her, "I want you to sing the second verse first, and then break into the bridge one bar early. Transpose the bridge up a minor third, but then back down again for the last three bars of it. Then add a 5/4 bar going back into the first chorus, singing on only off-beats. During the sax solo, hit the bridge a bar-and-a-half early, interrupting the solo, finish the first verse, go to the coda a bar late, and then keep singing for 3 beats after the rest of us have ended."
Her eyes widen and she says, "That's way too hard, I can't do all that."
He says, "Oh don't sell yourself short. You did it last night."
http://www.youtube.com/watch?v=-sUXMzkh-jI