On the evening of Wednesday April 19, ESP player Bill Kelliher of Mastodon did a rare meet-and-greet appearance at Guitar Center's flagship Hollywood store on Sunset Boulevard. We stopped by to say hi to Bill (because he just a cool guy to hang with), and to talk to few of the people who visited the store to meet Bill, get their copies of Mastodon's hot new album Emperor of Sand signed, and try out Bill's LTD Signature Series guitars, the BK-600 and Sparrowhawk.