Before a gig, the bandleader calls the female singer over to him and tells her, "Tonight, when we do 'Night and Day,' I want you to sing the second verse first, and then break into the bridge one bar earlier than usual. 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, go to the bridge a bar-and-a-HALF too early, interrupting the solo, finish the first verse, go to the coda a bar late, and then keep singing for a full 3 beats after the band has ended."
Her eyes widen and she says, "That's way too hard, I can't do all that."
He says, "You did it last night!!