Guitar Hero MMORPG

I noticed that there aren't any guitar hero or rock band like MMORPGs around at all. Although i realise it would be very unusual to have an MMORPG of this type but lately there have been all kinds of MMORPGs coming out and I'm surprised that not a single company has considered an MMORPG involving instruments. Although i don't think it will be long until a company will make an MMORPG of this type and hopefully it will be a good one. There has been one or two browser guitar MMORPGs but they have been closed down for some reason. Also there is lots of guitar hero simulations on PC out there such as JamLegend at http://www.jamlegend.com/ but nothing quite as progressive as an MMORPG where the player could purchase various guitars, have guitar battles, purchase clothing etc..