Sorry if this is old news to everyone but I have been having great fun with http://www.wolfgangsvault.com You have to register, but it's free and there are hundreds of great live concerts to listen to. Mainly 70s and 80s.
You can also download an app for an iphone to use that also.
Downside is that I am rediscovering lots of old artists, and having to buy loads of the studio albums
__________________ There are two rules for success: 1) Never tell everything you know