You better wach auf, you better nicht schrei, ‘cuz J.S. Bach is coming to town! The good folks at the UMass Amherst Music Department gotta a whole lotta Bach goin’ on in various Amherst venues, from concert hall to coffee house. From the pièce de résistance, the “St. John Passion,” to many (pun alert!) minor-scaled delights, the music will leave you not just well-tempered but in good temper. Here’s a preview in today’s Daily Hampshire Gazette. See you there?