I got rhythm, I got music. Lots of music in today's Tuesday puzzle by Steve Salmon (answers.) Who could ask for anything more? Nothing about music keys, unfortunately, so you have to wait to try out my name that key tricks.
Besides the above Ira Gershwin lyric, we had "Pomp and Circumstance composer" Mr. Edward ELGAR, "slowing in mus." for RIT (short for ritardando), "Lohengrin lass" which is probably not how ELSA of Brabant would refer to herself, and "musical beat" which is sort of a good clue for TEMPO. "Unaccompanied" (four letters starting with S) looked like it might have been musical, but turned out to be STAG instead which is a type of party where music is sometimes played, I imagine.
The theme gimmick relegates this puzzle to early in the week because once you get one the rest tumble out quickly, but it's completely appropriate and fun for a Tuesday. I wonder what a semimetal is. Apparently molybdenum fits that description as well although for some reason that wonderful word has never made it into a NYT puzzle. I can't imagine why...