I had an experience EXACTLY how you describe off blue music notes, same thing closed eye visuals, i could see stuff
around me with my eyes closed, and i would think im somwere else and suddenly realize im in my bed. I would close my
eyes and see my hand in front of me as i moved them around and saw them exactly as they were.
I was driving around (not the smartest idea) and i would see cars that would all of a sudden dissapear and people that
werent there, all in all it was fun as hell and the pills were around for a while so i did them like 3 times.
A more experienced freind of mine thought they had LSA in them (hallucinigen found in morning glory seeds)