[ad_1] Dave Grohl was the ultimate pretender this weekend while acting like he didn’t know Michael Bublé was going to join him onstage during Foo Fighters’ Outside Lands set. Bublé made a surprise cameo Saturday during the rock band’s show at the San Francisco music festival as part of a long-running gag involving his 2009… Continue reading Michael Bublé crashes Foo Fighters’ Outside Lands set