Customizing the no-chord symbol
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By default, rests in a ChordNames context cause the “N.C.” symbol to be printed. This markup can be customized.
\version "2.24.0"
<<
\chords {
R1
\set noChordSymbol = "—"
R1
\set noChordSymbol = \markup \italic "Ssh!"
R1
}
{
R1*3
}
>>