So it's not just about being anti idealism, there's a specific therapeutic utility that was being discussed in the Philodeman scroll with regards to music, and he was arguing that music could only heal the soul (through the practices of repetition and memorization, etc.) IF it contained the words of healing philosophy, which were the ones that had the potency to heal.
And this is what I completely disagree with. There is legitimate music therapy, using instrumental music, that affects moods and feelings, and facilitates physical healing. For some pointers, see https://www.health.harvard.edu…hrough-music-201511058556