What Canst Thou Sing?

Robin M discusses how music fits into unprogrammed quaker worship on her blog, What Canst Thou Say.

As much as I treasure the whole concept of unprogrammed worship,
the expectation of spirit-led spontaneity doesn't necessarily fit with the realities of musical performance.

In my Unitarian days, I performed in Church regularly. I knew when I was going to play, and it motivated me to learn a new tune, practice it, come up with interesting guitar parts, perhaps rehearse with a musical partner, etc. But other than that I'm not a regular performer. So I don't have a "stock" of songs just ready to "spontaneously" burst into when led by the spirit. If I were going to pick up my guitar and sing or play something, it would have to have been pretty intentionally planned and prepared before hand.

I suppose one solution to that dilemma is to prepare (but is that even kosher?) and then see if the spirit leads me to actually follow through. But the cards would be pretty stacked by that time, I think. "If the flesh is ready, the spirit will be willing?"