How many sopranos does it take to change a light bulb?

Answer: Just one, but the method is unique. She just holds her hand up and lets the world turn around her.

How many altos does it take to change a light bulb?

Answer: Altos do not change light bulbs: they just stand around complaining, "It's too high! It's too high!"

How many tenors does it take to change a light bulb?

Answer: Tenors do not change light bulbs either: they are technically challenged. Tenors have ressonance in their heads where their brains should be. (Sorry tenors but I am one also)

How many baritones does it take to change a light bulb?

If anyone has a good answer to this one PLEASE let me know!