Ambidextrous.
A bassist
an "accordionist"
a harmonist.
A guitarist.
a guitarist
An organist
Someone who plays the piano is commonly referred to as a "pianist." This term applies to both amateur and professional players. Pianists can perform a variety of music genres, from classical to jazz and contemporary styles.
a close call
lute player
lute player
Call them anything you like, they won't answer back!
An athlete