How do you know when a drummer is at your door?
The knocking speeds up.

How do you know when a trombone player is at your door?
The doorbell drags.

What do you call a woman on a trombone player's arm?                    a tattoo                                                    

yea i know this is super short but it'll get longer with time

 

Note: Some of these I made up, some I just borrowed from other sites, books, or people.