When you go to a major league baseball game these days, it is a highly mediated affair, with video and audio woven seamlessly into the live action. Recently, players have taken to personally selecting their “at-bat” song, that booms through the stadium as they walk out of the dugout and up to the plate. Players get real specific about what they want to hear – often sending a CD up to the control room before the game with a note: “Queue up track 3, 20 seconds in.” I got to speak to some of the Boston Red Sox about their favorite walkup songs. Mike Lowell, Alex Cora, Coco Crisp and All-Star slugger David Ortiz (pictured) all weighed in on the tune that gets them psyched up to hit. Megan Kaiser, the Sox music programmer, was my guide to the soundtrack of a baseball afternoon on the fabled field at Fenway.