Four Minutes (2007)

Sixty years ago Traude Kruger began teaching music at a women's prison. Now, on her search for possible students, she meets Jenny: a violent young inmate convicted of murder, and also a brilliant pianist. When Kruger convinces prison authorities to let her train Jenny for a public competition at the Berlin Opera House, the past resurfaces for both women and a lesson in humanity is learnt that they will each never forget.

Official website: http://www.vierminuten.de/