How many clarinetists does it take to change a light bulb?
Only one, but he'll go through a whole box of bulbs before he finds just the right one.

How many sopranos does it take to change a light bulb?
Just one; she just holds it in place, and the whole world revolves around her.

How many altos does it take to change a light bulb?
None, because they cannot reach it.

How many lead guitarists does it take to change a light bulb?
None, they just steal somebody else's light.