I had a non-lucid a few days back with me playing guitar. There was a girl in my room playing guitar and i just joined in and started playing the same song she was playing. I had never heard the song before, so i guess my subconscious made it up on the fly. I wish i could have remembered how it went, because it sounded pretty good. All i remember is using an open D major chord. In another dream, i saw a picture of a music staff with a few notes on it projected on the wall. I thought to myself that i could read it, but i didn't attempt to.

I think there is a lot of potential with music and lucid dreams. If i get proficient enough at lding and playing guitar, i might just try asking my subconscious for some awesome songs to play (granted that i can remember how they go when i wake up).