Classically trained on piano and violin; later switched to viola. Also play bass guitar 6-string guitar--rhythm player mind you, not lead!!! and some percussion (tambourine, maracas, whatever...).
briefly took trombone; didn't like it.
piano I've continued to play all my life. Guitar and bass came later and they've been with me for many years as well...
I've played professionally in everything from orchestras to string quartets to jazz bands to rock bands to theater music (including writing & performing the music for two local plays), and have loved every minute!