Conversation so far:
When did Paul McCartney first learn to play bass?
In 1961, Sutcliffe left The Beatles and Paul McCartney reluctantly became their bass player.
Why did Paul McCartney decide to play bass?
In 1961, Sutcliffe left The Beatles and Paul McCartney reluctantly became their bass player.

Question: Was he a good bass player?
Self-contained rewrite: Was Paul McCartney a good bass player?