Pianist Simone Dinnerstein has been playing, recording and living with J.S. Bach’s music for years. When Dinnerstein comes to the Wisconsin Union Theater on Friday, Dec. 4, she’ll play a program including Aaron Copland’s Piano Variations, four impromptus by Franz Schubert, Phillip Lasser’s Twelve Variations on a Chorale by J.S. Bach and Bach’s own French Suite.