Piano lessons with private teacher as a youngster and later for a while as an adult. Most useful thing was learning to read music. Sang in school & church choirs, then in a Bach choir ( not just Bach, but Handel, Mozart,Haydn, Palestrina, Bruckner, Britten - the whole range).Learnt a lot about breath control, phrasing & voice production there.
Never had a guitar, banjo lesson in my life, but picked them up easily as accompaniment instruments. English Concertina - again no lessons, but played in hundreds of sessions and gradually the fingering became automatic as tunes became more familiar. Still find it very useful to read music in order to pick up tunes half-remembered from sessions.
Mary Humphreys