You really don’t have any idea of how Gestapo thug Graham was about it.
He would be furious if any band played or tried to play a show not promoted by BGP.
As far as Woflgang’s Vault, they will settle.
Bill Graham may have ushered in corporate rock but it's hardly a dramatic case in the HORRIBLE music biz.
Get your money up front. And keep on playing.
The Blues Brother concert I am watching was telecast and radio cast (on KSAN). Contracts were signed and they certainly weren't as forced as the ones from gangsters.