An afternoon at the ballpark used to mean endless hours of old-fangled organ music. But these days savvy teams are mixing classic rock, country, and even a few hip-hop hits to cater to their crowds. ''If the Mets are losing 12 to 0, you need something to keep the fans entertained,'' says Vito Vitiello, associate producer of the scoreboard at New York's Shea Stadium. Here's the rock roster at three major-league ballparks. TORONTO BLUE JAYS When manager Cito Gaston approaches the mound: ''Handle with Care,'' the Traveling Wilburys Between innings: ''Start Me Up,'' the Rolling Stones When a Blue Jay hits a home run: ''Razzamanazz,'' Nazareth To pump up the crowd: ''(Tonight There's Gonna Be a) Showdown,'' ELO
NEW YORK METS When the Mets are behind: ''Hip Hop Hooray,'' Naughty by Nature When a Met hits a home run: ''Jam,'' Michael Jackson If the Mets have runners on base and the visiting team changes pitchers: ''Right Now,'' Van Halen It's the bottom of the ninth, and the Mets are behind: ''Rock And Roll Part 2,'' Gary Glitter
HOUSTON ASTROS When the visiting team makes a pitching change: ''Achy Breaky Heart,'' Billy Ray Cyrus Between innings: ''Boot Scootin' Boogie,'' Brooks & Dunn When the Astros call in a relief pitcher: ''Ace in the Hole,'' George Strait When a batter is hit by a pitch but isn't injured: ''Hurts So Good,'' John Mellencamp

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