Wolfgang's Vault
http://www.wolfgangsvault.com/Home.aspx
has recordings of concerts produced by Bill Graham over the years (going back as far as 1967), both at the Fillmore East and West, and various other venues.
The range of performers is astonishing: Beach Boys at the Fillmore West (1971), Stevie Wonder (1973), The Clash, Springsteen (1978), Steppenwolf, James Taylor (1970 & 71), Jimi Hendrix, Laura Nyro, Booker T and the MGs, Elvis Costello, The Everly Brothers (1969), Bryan Ferry, Miles Davis (1970) , The Byrds, Traffic, The Band (1974), Bob Marley, Cream, New Riders, Black Sabbath, Blondie (1978), Judy Collins, Sons of Champlin, Tom Tom Club, Van Morrison, The Cure, Quicksilver, The Impressions, Country Joe, Procul Harum, Sly and the Family Stone, The Rolling Thuner Revue (Dylan and Friends), and lots of Grateful Dead, among many, many otehrs
Daniel, among the country folks are Asleep At The Wheel Steve Earle, David Allen Coe, Tom T. Hall, Dwight Yoakum, Jerry Jeff Walker and Merle Haggard.