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Special considerations

Visibility following explicit changes

The break-visibility property controls the visibility of key signatures and changes of clef only at the start of lines, i.e., after a break. It has no effect on the visibility of the key signature or clef following an explicit key change or an explicit clef change within or at the end of a line. In the following example the key signature following the explicit change to B-flat major is still visible, even though all-invisible is set.

\relative {
  \key g \major
  f'4 g a b
  % Try to remove all key signatures
  \override Staff.KeySignature.break-visibility = #all-invisible
  \key bes \major
  f4 g a b
  \break
  f4 g a b
  f4 g a b
}

The visibility of such explicit key signature and clef changes is controlled by the explicitKeySignatureVisibility and explicitClefVisibility properties. These are the equivalent of the break-visibility property and both take a vector of three Booleans or the predefined functions listed above, exactly like break-visibility. Both are properties of the Staff context, not the layout objects themselves, and so they are set using the \set command. Both are set by default to all-visible. These properties control only the visibility of key signatures and clefs resulting from explicit changes and do not affect key signatures and clefs at the beginning of lines; break-visibility must still be overridden in the appropriate object to remove these.

\relative {
  \key g \major
  f'4 g a b
  \set Staff.explicitKeySignatureVisibility = #all-invisible
  \override Staff.KeySignature.break-visibility = #all-invisible
  \key bes \major
  f4 g a b \break
  f4 g a b
  f4 g a b
}

Visibility of cancelling accidentals

To remove the cancelling accidentals printed at an explicit key change, set the Staff context property printKeyCancellation to #f:

\relative {
  \key g \major
  f'4 g a b
  \set Staff.explicitKeySignatureVisibility = #all-invisible
  \set Staff.printKeyCancellation = ##f
  \override Staff.KeySignature.break-visibility = #all-invisible
  \key bes \major
  f4 g a b \break
  f4 g a b
  f4 g a b
}

With these overrides only the accidentals before the notes remain to indicate the change of key.

Note that when changing the key to C major or A minor the cancelling accidentals would be the only indication of the key change. In this case setting printKeyCancellation to #f has no effect:

\relative {
  \key g \major
  f'4 g a b
  \set Staff.explicitKeySignatureVisibility = #all-invisible
  \set Staff.printKeyCancellation = ##f
  \key c \major
  f4 g a b \break
  f4 g a b
  f4 g a b
}

To suppress the cancelling accidentals even when the key is changed to C major or A minor, override the visibility of the KeyCancellation grob instead:

\relative {
  \key g \major
  f'4 g a b
  \set Staff.explicitKeySignatureVisibility = #all-invisible
  \override Staff.KeyCancellation.break-visibility = #all-invisible
  \key c \major
  f4 g a b \break
  f4 g a b
  f4 g a b
}

Transposed clefs

The small transposition symbol on transposed clefs is produced by the ClefModifier layout object. Its visibility is automatically inherited from the Clef object, so it is not necessary to apply any required break-visibility overrides to the ClefModifier layout objects to suppress transposition symbols for invisible clefs.

For explicit clef changes, the explicitClefVisibility property controls both the clef symbol and any transposition symbol associated with it.

See also

Learning Manual: Visibility and color of objects.