Here's another twist, we are a group of 60 -65 retired folks putting together a Classic Rock Band, been working for a few months now putting together (3) sets of songs that we really know backwards and forwards, good mix of dance and sing along songs. Practice, practice, practice, thought we had it down but realized one day (after recording a session) we were missing a critical piece. We never practiced our back-up vocals! Huge mistake, our songs sounded empty and in disarray, although we have very good musicians and a decent lead singer. Here's another tip, record your practice sessions.