Transposing instrument
INSTRUMENT FOR WHICH MUSIC IS CONVENTIONALLY WRITTEN TRANSPOSED TO A DIFFERENT PITCH
B-flat instrument; Nontransposing instrument; Transposing Musical Instrument; Transposing instruments; Transposition convention; Instrument transposition; Transposing Instrument
A transposing instrument is a musical instrument for which music notation is not written at concert pitch (concert pitch is the pitch on a non-transposing instrument such as the piano). For example, playing a written middle C on a transposing instrument produces a pitch other than middle C; that sounding pitch identifies the interval of transposition when describing the instrument.