For a famous violinist, Midori cuts an intentionally low profile, so you can be forgiven for not noticing that she will be performing a Bay Area recital soon, for San Francisco Performances. And because she’s rarely making news, you may not know that she’s been working on the Bach violin sonatas and partitas, four of which she’ll play here. Bach lovers should be swarming the theater, but don’t let that deter a visit to explore these marvelous pieces for the first time.