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For example, when reading piano music on a grand staff, I know that if there is an A# in the treble clef staff (where it's normally natural), it changes all of the A's in the rest of that measure to A#.

Do all of the As in the bass clef staff stay natural unless they also have a # symbol next to them, or are they all affected by the # in the treble clef?

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4 Answers 4

up vote 10 down vote accepted

The answer to the question in the title of your post is, "it depends." As a general rule for Western notation as it is practiced in the United States, the answer would be "no"; not only is each staff independent with respect to accidentals, each octave is independent with respect to accidentals. However, when an accidental is present in one staff but missing from another, and the accidental is not merely cautionary as in your example, a misprint is likely unless you know that such a "clash" is within the style of the piece. The same applies to an accidental missing from one octave of a staff. Within a staff, however, in some French publications, an accidental applied to one octave is intended to apply to all octaves. This phenomenon appears with some frequency in the "classical" saxophone literature. I would expect different staves still to be independent in this case, but again, misprints are possible.

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By jove, you're right! I'll have to give the acceptance to you then :) –  Nick Feb 28 '12 at 1:09
    
Thank you, although I'm dismayed by the "it depends". In that case I've got a Grade 1 ABRSM theory book with a very bad example in it :-( –  Doctor Jones Aug 30 '14 at 16:07

An accidental on a note should affect all of the same note (regardless of octave) for the rest of the measure. This is the case for piano, where one performer is playing multiple clefs.

However, for an orchestral score, I would assume that each line is autonomous, whether in the same clef as another instrument or not.

As far as I am aware, the common practice is to write the accidental in each clef for the sake of clarity, even when not specifically required.

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tpburch is correct about the grand piano staff, and that would also apply to other grand staff instruments, such as marimba.

However when in the case of clefs being for different performers, such as choral scores, orchestral scores, brass quintets, etc., each clef is treated on an individual basis.

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You may need to distinguish between accidentals and sharps and flats that belong to the key. If the key is D sharp then that is the key for all the clefs in a specific bar. There may be some reasons that notes are raised or lowered that fall outside issues regarding key.

There may be some chromatic passing notes that may very easily have sharps or flats in them that do not signify a change of key. They may also be specific to a clef and not necessarily happen on all the clefs / voices of a piece.

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