along with playing musical instruments on a few of their songs (organ on "you won't see me", trumpet on "helter skelter", tambourine on "dear prudence", and an anvil on "maxwell's silver hammer"), and singing on "yellow submarine" and "you know my name (look up the number)", evans also helped with lyrics from time to time. paul mccartney paid him in cash for help with "fixing a hole", instead of giving him co-credit.