Given the brilliance of Mose Allisonās lyricsāpointed, wry and delivered in a knightly laid-back mannerāitās important to remember that the man behind the beatnik classics āYour Mind Is on Vacationā and āEverybodyās Cryinā Mercyā is also a hell of a pianist. At 29, he included on his very first album for Prestige Records Back Country Suite only two vocal tracks; the rest, ivories, played in his impossible-to-nail-down style. Now 82, Allison can appreciate his status as a living legend, but he doesnāt rest on his greatest hits. In concert, heās as nimble on the keys as he is varied in his set lists; thereās no telling when heāll premiere a new composition or, for that matter, unearth a forgotten chestnut from an obscure 1940s Nat āKingā Cole session. Cross your fingers for āLost Mindā and āYoung Man Bluesā when he appears on Saturday, Nov. 21, at 19 Broadway Nightclub. 19 Broadway, Fairfax. 4:30pm and 7pm. $25ā$30. 415.459.1091.Gabe MelineĀ