Just as San Francisco is not like most cities, Quartet San Francisco is not like most chamber music ensembles. Take a tour of YouTube and you'll find more clips of QSF playing pieces like the Beatles' "Oh, Darling," Piazzolla's "Libertango" and the Dave Brubeck Quartet's "Take Five" than works from the classical chamber repertoire. Quartet San Francisco sizzled at the PAC in January when they performed with Tulsa Symphony. This month's concert is the group's long-awaited solo concert originally set for February 1, the day Tulsa received a record-breaking snowfall. Let's give them a much warmer welcome this time.