Sammy Hagar

Singer said his ex-bandmate had practically been waiting for him to call in the last few months of the guitarist's life.

"It's very surreal now," says bassist. "It hasn't sunk in yet."

Hagar says he feels that he and Eddie Van Halen are 'not done.'

The 72-year-old rocker speaks.

The latest Lockdown Session with the Circle is a rendition of the 'Let There Be Rock' classic.

New episodes feature Gary Cherone, Def Leppard, Brian May, Joe Walsh, Ted Nugent and others.

George Thorogood and Metallica's James Hetfield also perform during two-hour AXS TV special.

Making 30 stops.

Trio will play outdoor venues across the U.S. this summer.

Hopes for a global Van Halen resurgence ended in Arizona after 80 tense concerts with Sammy Hagar in 2004.