Allman Brothers Band

"I consider it an honor to have crossed musical paths with him," said the Doobie Brothers' Michael McDonald.

With its unprecedented third set, this became one of their longest-ever concerts.

Co-founder of the Allman Brothers Band was 80 years old.

He'd been suffering from cancer and chronic obstructive pulmonary disease.

"People may find that hard to believe, but it had never happened," Warren Haynes tells UCR. "It was history."

Deaths of Duane Allman and Berry Oakley still loomed in 1973.

Artists were all at distinctive – yet very different – points in their careers.

They'd reestablished themselves with 1990's well-received 'Seven Turns,' but something was still missing.

Set includes material recorded by Grateful Dead's soundman at famous New York City venue a year before more famous shows.

The group's long, complicated history isn't always an easy one to navigate.