The Piano Teacher

Erika Kohut is a pianist, teaching music. Schubert and Schumann are her forte, but she's not quite at concert level. She's approaching middle age, living with her mother who is domineering then submissive. Erika is a victim then combative. With her students she is severe. She visits a sex shop to watch DVDs, and she walks a drive-in theater to stare at couples having sex.