Hagar organized the event through his Hagar Family Foundation to benefit the Pediatric Cancer Program at UCSF Benioff Children's Hospital which will be taking place on May 15th at the Fillmore in San Francisco.

"I've seen first hand the great work they're doing and how vital community support is," Hagar said. "I ran the idea of a benefit concert by James (Hetfield) and we quickly had an amazing lineup of artists on board, then Live Nation stepped up with The Fillmore and now we've got an epic event -the first of many hopefully - so we can help keep their research and programs funded and on the path to a cure."

Aside from Hagar, Hetfield, Satriani and Armstrong, the unplugged event will also feature performances from Train's Pat Monahan, Scott Matthews and Heart's Nancy Wilson.

"This is sure to be an unforgettable evening, and we're so very grateful to the Hagar Family Foundation for their incredible support of UCSF Benioff Children's Hospital," said Jean Nakamura, MD, Associate Professor Radiation Oncologist at UCSF Benioff Children's Hospital. "UCSF Benioff Children's Hospital is recognized as one of the leading children's hospitals in the world, largely due to the ongoing support of our community."