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Willie Watson sounds like he could have wandered out of another era. Erin Rae is more likely to bend those old folk and country traditions into something hazier and harder to pin down. Together, the two singer-songwriters make for an intriguing roots-music pairing.
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Willie Watson and Erin Rae: 8 p.m. Saturday, Aug. 22. $45.40. The Club at Napa Music Hall, 1030 Main St., Napa. www.napamusichall.com • 8 p.m. Tuesday, Aug. 25. $28.81. Cornerstone, 2367 Shattuck Ave., Berkeley. www.cornerstoneberkeley.com • 8 p.m. Wednesday, Aug. 26. Mystic Theatre, 23 Petaluma Blvd N., Petaluma. www.mystictheatre.com…