I'm a new upright player and helped out as the bassist at a local open mike session recently. Several songs were brand new to me, including some originals, so the first couple of times through them I didn't know what chord was coming in certain places. What do you do on the bass when you have absolutely no idea what's next? Do you just try to play a note that might fit several chords, or play a string without pressing it to the fingerboard so you get a sound but no note, or do you not play? I tried to watch the singer/guitarist's left hand but when you're standing behind him or her you can't see too much!