ON FRIDAY, DR . Arthur C. Bartner, the 85-year-old retired band director at USC, stood at the 50-yard line of the Los Angeles Memorial Coliseum before the Trojans' game against Northwestern, looking for an old friend.

Suddenly, Mick Fleetwood, the legendary drummer from Fleetwood Mac, showed up. He saw Bartner, and his face lit up. The 79-year-old drummer embraced his old friend in a huge hug.

"The look on his face was priceless," Bartner said. "I mean, there was a genuine appreciation and love for our relationship through the years."

In 1979, the two men joined forces to make American music history, when Fleetwood convinced Bartner to lend him the Trojan Marching Band for the recording of "Tusk," the title track of a Fleetwood Mac album at the height of the band's powers. It would go

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