but I don't see that "voting with your wallet" works well in general.

I agree. Would need to span all products - not just music - and mindlessly enhance my existing buying behavior. The problem is that boycott-able products are a small fraction of my total purchases. Could work, once I start buying everything with a smart phone. Then a plug-in, similar to those found on iPhone's Passbook, could pop up with a vendor rating. I would subscribe to such a service.

Until then, I’ll just boycott Guitar Center.