Cryptic crossword No 2,922

Very niche, even for a professional muso! Big fan of themed grids, though, and some brilliant clueing - enjoyed how you got 12a, to link in. 17d also lovely.

Not easy, and the large amount of specialist knowledge required would be a problem for any muggles. Some eyebrows raised here at a few highly technical entries, but I gave a particular nod of appreciation when 1a and 7d (COTD) dropped together.