As Sheryl Crow might sing to the Big Brother housemates, change will do them good. In fact, Crow can tell them in person when she appears for a surprise concert Aug. 21 in the BB3 backyard. The eight remaining contestants -- confined since July 6 in a house with no music or TV -- will be treated to two songs from Crow's current C'mon, C'mon as well as ''All I Wanna Do.'' ''Last year, we had the Survivors come in [to BB2] so we certainly wanted to have another special event,'' says exec producer Allison Grodner. ''It's going to be a complete surprise for them.'' Not nearly as surprising as CBS' coup in persuading Crow to soak up the BB3 sun. ''She's a fan of the show,'' says Interscope spokesman Dave Tomberlin of the unusual gig. ''And when was the last time she got to play for eight people in a backyard setting?'' Next stop: Home Shopping Network?


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