Samown, define “good, geshmaked Jewish music”. Chazanus sounds just like opera. I guess you can’t call THAT ggJm. About 50% of negunim from davening comes from R’Shlomo Carlbach. Many people don’t call him fit to listen to either. Many old Chasidic negunim come from goyish influences. I have to tell you that the traditional Chasal Sidur Pessach really sounds to me like a drinking song.
22OldGold, I beleive Achar became an apikorus after learning kabala when he wasn’t on that level. I don’t remember learning that music had anything to do with it.