Success is different for every artist - I get psyched when i help realise their vision etc.
Matt SquireI like to get a vibe first, then a melody and really beat up the melody for a while, then try and find a lyric that really suits him/her.
Matt SquireTraditionally, an engineer is responsible for capturing sound - microphone choice, gear, etc. A producer can have a number of different responsibilities - anything from songwriting to judging performances - setting mood, and (perhaps most importantly) choosing which songs to work on!
Matt Squire