Originally Posted by eclipseownzu
...Trust me, after 3 hours of watching the guitarist try and work out the chord progression to link the only two riffs he has ever written, you would kill to play a cover song.
Huge point here. Members should show up already knowing their part. It's a huge waste of time in rehearsal to spend it defining chord progressions or working out technical parts on individual instruments when everyone else is just sitting there. If it is a cover tune, then obviously there is a recording, and the guitar player, piano player or whoever should already have the part worked out on their instrument before they show up. Running covers at rehearsal should really just be a simple one and done process. This is of course the ideal, and hardly ever the case. But it is something that drives me nuts about adding material with limited rehearsal time.