Music: Return to Good-Times Rock

The conga line forms midway through the Beach Boys' second encore, a lilting paean to puberty called California Girls. By the time the song ends, the line has grown to 5,000 teen-agers and is snaking all over Kansas City, Mo. 's Arrowhead Stadium. Turning toward the stage, the churning serpent finds a lion's voice: "Chicago, Chicago!" As 35,000 spectators pick up the chant, seven young men amble onstage to join the Beach Boys for a socko finale. They are the group known as Chicago. With five guitarists, two drummers and a three-piece brass section wailing, the combined bands form a rock...

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