2020, book 8: Music by the Numbers: from Pythagoras to Schoenberg, Eli Maor

Maor is a former professor of the history of mathematics, not of music nor of physics. The result is some light fluff with the occasional factually questionable or outright fancicul statement.

This could have been great. Instead it is mediocre popular history, with the occasional well-meant but poorly applied hints of mathematics, physics, and music.