When writing music for a transposing instrument, or teaching how to play the notes, the entire series of notes is written and described as notes moved up or down a number of semitones. For example: playing the note that is called "C" on a B flat clarinet, produces the note that is called "B♭" when played on a piano. All transposing instruments such as "horn in F" or "alto saxophone in E♭" mean F and E♭ in normal notes ("concert pitch"). The note "C" as written and played on the horn in F will sound like an "F" , and the same "C" written for the alto saxophone in E♭ will sound like "E♭".