How successful is y2js fozzy rock group?

Answer 1

Moderately. They have a loyal fan base though. This is a common attribute of acts playing the "heavier" music. That's why there are still over 70,000 metal bands even though you never hear about them.

Basically, they have a couple of hundred thousand album sales, but their strength is that their guitar player, Rich Ward, is super talented and since he writes/produces their songs, they get a solid product, whilst maintaining the "keep it small, keep it all" attitude.