Someone who plays dumb can be referred to as a "feigned ignoramus" or simply as "playing the fool." This behavior often involves pretending not to understand or know something in order to avoid responsibility, manipulate a situation, or gain an advantage. It can also be seen as a tactic to lower others' expectations or to elicit sympathy.
lute player
It is called a solo. The texture is called 'monophonic' texture (it means "with no accompaniment").
a "Synth Player" or "Synthesizer Player"
Old Americans invented it went they were playing the drums they hollowed out drum sticks.
It means someone individually plays a short piece of music (usually the leader), and the rest of his/her band replies to it by doing another short piece of music.
You would call them either mute or dumb (as in "deaf and dumb").
dumb
If someone is unable to speak, it's called being 'dumb'.
A bassist
an "accordionist"
a harmonist.
A guitarist.
a guitarist
An organist
lute player
lute player
Call them anything you like, they won't answer back!