Screeching sound overlapping with vocals on Harman Kardon system.

Trying to fix it before I have to bring it back to the dealer. The high frequency screeching sound only happens on some songs, probably not even the majority. I've tried adjusting the eq on both car and the music app on every setting, tried 3 different apps, updating my phone, adjusting where the music is coming from. Its happening on carplay and bluetooth. The dealer tested out my songs on other cars in the lot and didnt hear an issue.

Tyia