Quiet Riot

Smash Mouth, Trapt, Fozzy and other acts played the mass gathering.

Drummer spent 39 years in the chart-topping metal band.

Quiet Riot drummer says he didn’t stop working on new album despite being diagnosed with serious illness.

"The road ahead is not going to be easy but cancer has met its match and I plan to continue fighting."

They were the first heavy-metal group to capture the top spot on the 'Billboard' Top 200 Albums chart.