This is part rant, part asking for advice. My band has been playing around with this one song for awhile based on four guitar chords. The song is instrumental/experimental and consists of the guitarist doing a lot of improvisation while I keep playing my bass part over and over. It originally consisted of playing nothing but 8th note roots (E, G, D, A) but I felt that playing nothing but roots over and over was too simple and amateurish so I opted for another line consisting of a quarter note progression of root-octave-fifth-root over and over. But even this didn't seem to satisfy what I was looking for. I'm now in a rut where I can't develop an interesting bassline for this song. I could see doing nothing but roots over and over but this still bothers me as being "too simple". On another note: I asked my guitarist for the list of chords he uses on this song and...got tab. Not bad but considering I was hoping to use the chord to develop a bass line this kinda irks me. Ideas of how to convince him to give me the actual chords?