Vocalist asks her keyboard player, "I'd like to do 'My Funny Valentine' tonight... but can we to 'jazz' it up a bit?"
Keyboard player replies, "Sure, we can do the first chorus in G minor, then modulate to G# minor for the second chorus in 5/4 time, then modulate to A minor in 3/4 time for the bridge, then cut off the last 3 bars!"

She claims,"that might be too complicated to do without a rehearsal!"

Keyboard player responds, "Well, that's how you did it last night!"