Hello, Elle!
I did not know Monteverdi's first name, too, but I wondered if it would help with the answer, and I looked it up, and it did!
But, I did not know CL was 10cc. I presumed it was something to do with it, though.
22d, I don't see why music should be mentioned in the clue?
Mi and me are alternates of each other in music.
That should be clue enough?
16d, "up" means reversed, and you need north for "n".
Dalesman is the answer. Do you think there is something missing?
I have checked online and the clue is the same as in the paper.
I have mentioned before to you, Elle, I do not know what "&lit" means.
I just solve the clues in a simple fashion and that is enough for me.