Apparently JetGroove had legal problems selling music. Most of the stuff they had was not available for sale, but you could still listen to a streamed version. Now even that feature is gone. All the (about) 100 tracks I selected but couldn't buy (and didn't bother listening as streamed) are now gone !
Of course it's the copyright pigs again at work. They can't stand when anyone but them can make money on music. Even if that's a service they don't even offer (underground music mostly found on shitty vynils). So the guys with the big MP3 collection behind JetGroove know what they should do : spread the music for free on P2P to piss the pigs even more !!!