San Francisco jazz pianist Vince Guaraldi (right, with characteristic handlebar moustache) wrote music for “Peanuts” specials, influenced countless musicians, and created one of the top-selling Christmas records ever (“A Charlie Brown Christmas”), but in-depth appraisals of his career are scarce. Davis author Derrick Bang has fixed that with “Vince Guaraldi at the Piano,” an account of Guaraldi and his music. Bang holds a copy of his book, left. Guaraldi, who performed in Davis in 1963 and 1972, died of a heart attack at 47 in 1976. Bang worked on the book for three years, talked with musicians Guaraldi played with—some still performing—and today on Davisville, he discusses what he learned.