There was a book I loved when I was about 12-13, I think - around 1990 and I don't think it was brand new. It was a story set in Cornwall and was good about the sea, cliffs etc. The main character was a teen or pre-teen girl who was good at piano and had to go on a train for an audition to music school in London. I. The audition she binned off her practised piece and improvised a piece of her own inspired by the Cornwall landscape.
Does it ring a bell for anyone? I think the name Oliver was in it somewhere but not sure I remember why.