The Piano at the Station by Helen Rutter
Lacey's smart tongue and quick temper are constantly getting her confined to isolation at school. But there's a lot more to her that most people never see, and when Lacey gets sent to lunch-time music lessons to keep her out of trouble, she discovers a love and talent for the piano that opens up a whole new world for her.
Just as she's really beginning to make progress, her music teacher has to leave, which throws Lacey back into turmoil. Will she go back to her self-destructive ways or will music offer her a way to save her from herself?