Musician Jeremy Plog doesn’t mind playing a doubleheader on Saturday because he’s a big baseball guy. Plog is on bass with headliner Jackie Greene Band at the Crystal Bay Casino and on guitar for openers Golden Cadillacs. “I am playing every gig I can, juggling all my bands and day job,” Plog said in a phone interview after dropping his son off at his Little League game. The Roseville resident has probably been in more bands that much-traveled pitcher Edwin Jackson has had big league uniforms (14). He’s also coached former San Francisco Giants Tim Flannery and Jake Peavy as they transitioned from the diamond to the stage as guitarists.