I've been generally lucky in that few of my musical heroes have turned out to be bad uns.

One exception, relevant to this thread: the German pianist Wilhelm Backhaus. I used to love his Chopin recordings - they are extraordinary, genuinely great music. Then I learned he was a Nazi in a very complicit cowardly way.

A part of me thinks that in practical, real=world terms it makes little difference whether I tacitly endorse this music by listening to it: he is long-dead, nobody gains or loses anything by me listening or not listening to him, nobody even knows or cares.

But the few times I listened to his music after I learned of his unnecessary complicity with the regime (he was a Swiss citizen, he was free to travel) I just felt grubby and soiled and turned it off.

I felt similarly listening to David Bowie and Led Zeppelin after I heard about the Lori Maddox stuff.