A: He can't find the key and doesn't know when to come in.
Q: How many lead singers does it take to change a light bulb?
A: One. He holds the bulb while the world revolves around him.
Q: Did you hear about the female opera singer who had quite a range at the lower end of the scale.
A: She was known as the deep C diva.
A: Six. One to do it, and five to say, "It's too high for him."
Q: What's the inscription on dead blues-singers tombstones?
A: "I didn't wake up this morning..."
A: None. They can't get up that high.