I don’t know what these books are about but I’ve attended two lectures at college, one by Winton Marsalis and another by Robert Levine.
The first discussed pernicious racism in the music industry and how that artificially divided white and black music, mostly for profit. The latter about how totalitarian regimes felt control of music was very important to maintaining control.
So I don’t think much of Illuminati like conspiracies of magic spells being sent through music but I do think that there’s always someone trying to make money or control society or both by controlling art. We have plenty of examples of those in our history.