'piano exam' is correct and usable in written English.
You can use it when referring to a test or assessment conducted to gauge someone's ability to play the piano. For example, "My daughter is taking her piano exam tomorrow."
Sitting his grade one piano exam, as the leaden-fingered politician did last year, was apparently "more frightening" than speaking in the Commons.
Driving into Oxford from London, the first stop we make – after passing the old bingo hall where I did my Grade One piano exam and Bury Knowle Park, where at least one girl in my class lost her virginity – is probably Headington's most famous landmark: a shark.
At the age of four, she passed piano exams adjudicated by the composer Granville Bantock: in 1968 she sang in a BBC concert to mark the centenary of his birth.
The politicians who seem most human are those with lives outside Westminster's airless corridors: Ken Clarke's love of serious jazz and F1 motor racing, Michael Heseltine's passion for trees, Ed Balls taking piano exams or Margaret Hodge playing Mendelssohn helped make them all plain talkers in a world of ear-aching politics-speak.
Curtis Elton, eight, is thought to be one of the youngest people in the country to pass a Grade 8 level music exam on the piano.
When she's not doing schoolwork or environmental campaigning, Basu plays the piano (she's just passed her grade eight exams) and the guitar.
She'll force us to stay up all night studying for an exam we don't care about or playing the piano until our fingers bleed.
Karabits comes from a musical family – his father was a composer – but the young boy's initial musical training, studying the piano, was not a happy experience".I hated those exams where you had to go on stage and play.
Yvonne and I agreed that exams were really not relevant and I stuck at the piano for a while longer.
I figured that I could handle the other responsibilities: taking Jacob to his daily rehearsals and to the intensive piano lessons required by the director, making appointments for his haircut, costume fittings, and the mandatory doctor's exam.
