Murray, I think there's a big difference between "having memorized a song" and having it rehearsed to the point of "concert performance [with] imaginative and immaculate guitar backing...".

If I can sit down and write the lyrics out to a song, or sing them in my car, without error, I'd say I have committed those songs to memory. The fact that one sometimes goes blank or gets one's tongue twisted during a performance doesn't negate that. (Once in a while I even have some trouble recalling a phone number that I've called hundreds or thousands of times from memory.) Similarly, if I can sing the tune, I obviously know the tune. Complex arrangements are another matter.

Genie