Sammy Hagar was on the road with the "Best of All Worlds tour", which is focused on Van Halen material and his band is formed by Jason Bonham, Michael Anthony and Joe Satriani. However, Bonham recently had to leave the tour because of a medical emergency with his mother, that's what Sammy revealed in an interview with KSHE 95 (Transcribed by Blabbermouth). He was replaced by the drummer Kenny Aronoff, who had already played with many incredible artists. Sammy Hagar explains why Jason Bonham had to leave his tour "Well, I've known Kenny for a long time. Kenny has been my backup drummer for about — not just me. You talk to Billy Gibbons, you talk to anybody, they're gonna tell you that he's their backup drummer because he's the only guy that you can hand a setlist of 24 songs and in 24 hours he can play 'em." "Jason's (family emergency) was a sudden thing. His mother had a stroke and went into a coma and it's serious. So (his) whole family went over there (to the UK). And he held out for two or three days, and he says, 'I gotta go. I gotta go.' I said, 'You go. Go.' So we told Kenny. He had about 24-hour notice. And he came in the first night. He got there at six in the morning. We played that night in Cincinnati. And he did a 90-percent perfect show. I swear to you, I make more mistakes every night than he did. So that's big hats off to this guy." "The (U.S.) tour is over now, but we're going to Japan. And if Jason is still with his mom, he's gotta be there till she either comes through or… whatever. I shouldn't be talking about his personal business, but he's got a medical emergency with his mother. You don't ignore that. We got Kenny, thank God. And if we have to go to Japan with him, we'll go to Japan. I just love playing with him 'cause he's so enthusiastic. He's the most enthusiastic guy. 'Oh man, we're gonna kill it. Oh, don't worry about me.' He's, like, foaming at the mouth. He's crazy," Sammy Hagar said. https://www.youtube.com/watch?v=FWRVeDhfTjQ&pp=ygUQc2FtbXkgaGFnYXIgMjAyNA%3D%3D