Not just in music but I personally don't buy/go to see Russell Crowe films since the phone incident.
I won't buy any album with R Kelly on it and "I Believe I Can Fly" tends to crop up on a few compilations.
Have rid my collection of and refused to spend any money making Mel Gibson richer since the Nazi thing. I'm sure he doesn't care but I'm just doing what feels right for me.
Have heard of Chris Brown but not a fan anyway. This would put me off.