Rock legend Sammy Hagar has enjoyed a long and hugely successful career – but his last tour as frontman for Van Halen in 2004 ranks as one of the biggest disappointments of his professional life.

Sammy Hagar heard about Roth’s departure before it was made public. He’d been tipped the wink by long time Van Halen producer Ted Templeman, who had also worked on Hagar’s last album, VOA. But it ...