Music Store/Chartbuster
Chartbuster had been bought by DigiTrax, and will re-emerge as Karaoke Cloud.
I'm working on getting this integrated into kJams, but they seem to have jumped the gun without telling me, leaving you all high and dry. Sorry about that, this kind of thing happens when I rely on a third party and unrealistically expect that they will have the same great customer service that I want to provide.
Update: They're switching it back so your old Chartbuster streaming should still work.