Trombonist. In my school band, we sometimes call ourselves boners. heh heh.
tromboneist
Currently he plays a Palatino WI-817TB
A saxophonist.
A pianist.
A djembe-ist.
A pianist.
It matters which brass instrument. Someone with a Trombone is a trombonist, someone with a tuba is a tubist, and someone who plays a Trumpet is a trumpeter. It's all very complicated.
A bazookaist is a person who plays the bazooka - a form of primitive trombone.
The trombone usually plays in a group unless the person who is playing it is doing a solo(dancing/singing/playing an instrument on your own).
The Trombone
The trombone does not play classical music, it plays jazz. :)
stuff
Currently he plays a Palatino WI-817TB
A "harmonicanist" is what a person who plays the harmonica is called.
A person who plays Scrabble is called a Scrabbler. (unofficially)
A trombone.
A drummer or percussionist plays the drums.
a cymbalist