Violin Cloaking Device

Q: How do you keep your violin from getting stolen?
A: Put it in a viola case.

Drum Keys

Q: Did you hear about the drummer who locked his keys in his car?
A: It took him four hours to get the bass player out.

Viola and Trampoline

Q: What is the difference between a viola and a trampoline?
A: You take off your shoes before you jump on the trampoline.