Yay, I just got an invitation to Music Beta.
However, they don't support Linux, so I can't use it.1
I can see the logic behind not supporting Linux. It is only 1-5% of the desktop market. But it is announced at a developer conference, where I'm sure the Linux market share was a bit higher. And among new technology adopters, I'm sure Linux market share is a bit higher. New products need adoption, and you don't really want to prevent that because of what seems to be an oversight.
Google makes plenty of good web apps (and a handful of crappy desktop apps). They couldn't have done this in Chrome?
Their inability to come to an agreement with music labels and their poor choices in implementation do not bode all that well for the service. A lesson for us all.