If an instrument is a percussion instrument with indeterminate pitch.If an instrument is a transposing instrument.In a score containing more than one instrument, all the instruments are usually written with the same key signature. For example, if a five-sharp key signature is placed at the beginning of a piece, every A in the piece in any octave will be played as A sharp, unless preceded by an accidental (for instance, the A in the above scale - the next-to-last note - is played as an A ♯ even though the A ♯ in the key signature is written an octave lower). The effect of a key signature continues throughout a piece or movement, unless explicitly cancelled by another key signature. For example, if a key signature has only one sharp, it must be an F sharp. The sequence of sharps or flats in key signatures is generally rigid in music from the common practice period. The purpose of the key signature is to minimize the number of such accidentals required to notate the music. In principle, any piece can be written with any key signature, using accidentals to correct any notes where it shouldn't apply. B major scale: key signature accidentals not needed
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