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Rhythm and blues performed through a nose flute? Soul classics interpreted underwater? The Great American Songbook sung by the “grown-up voice” from Peanuts specials? Describing Boz Scaggs’ music is as difficult as getting your arms around the veteran singer’s biography, which includes attending high school with Steve Miller, enlisting Duane Allman and the Muscle Shoals Rhythm Section in a quixotic attempt to make a mainstream record, becoming the essence of yacht rock (and accidentally creating Toto) with his 1976 classic Silk Degrees, then semi-retiring as a gentleman vintner and co-owner of San Francisco nightclub Slim’s. Nice life, Boz! Bring your open-collared party shirts, your sense of hard-earned self-satisfaction, and an appetite for stone classics like “Lido Shuffle,” “Jojo,” and “We’re All Alone.” And maybe by the end of the show, you can come up with a better description than any of mine. SCAGGS PERFORMS WITH DAVID JACOBS-STRAIN AT 7:30 P.M. AT THE BIRCHMERE, 3701 mount VERNON AVE., alexandria. $89.50. (703) 549-7500.