When he’s not windmilling wildly signaling Buster Posey to go for home, San Francisco Giants third base coach Tim Flannery is windmilling his guitar like Pete Townsend. OK, maybe he doesn’t get crazy and smash guitars onstage, but he is a good songwriter with a voice of wisdom. He’s even sung harmony with the Grateful Dead’s Phil Lesh and Bob Weir before games at the Giants ballpark. The real question is, after two World Series titles in three years, where the hell does he get the time to do all this? Tim Flannery plays Friday, Jan 25 at Sweetwater Music Hall. 19 Corte Madera Ave., Mill Valley. 8pm. $22. 415.388.3850. He also plays with friends Saturday, Jan. 26, at the Uptown Theater in a benefit concert for Bryan Stow.1350 Third St., Napa. 8pm. $49—$100. 707.259.0123.