“ If there is no set of either sharps or flats, then the key is either C major or A minor and no code needs to be entered (unless dealing with transposing instruments) . Each key signature has two relative keys, a major key and a minor key. ”

“ This can be raised an octave by entering an apostrophe after the note (but before the duration or any other modifier) ; two apostrophes will raise the pitch by two octaves, etc. The opposite, lowering the pitch by an octave, can be done by entering a comma after the note; again, two commas will lower the pitch by two octaves, etc.
Absolute notes If the relative command is not used, pitches will be absolute and each must be set manually. As with relative notes, commas and apostrophes following the pitch name will decrease or increase the octave. All notes are relative to bass c. ”

“ Associated voice Lyrics with manual duration will be left-aligned to the position of the appropriate note in the score. Extender lines also cannot be generated as the lyrics are not associated with any note and the the length of the line cannot be determined. To overcome that, the \set associatedVoice command can be used to associate, or link, the lyrics with a melody in another block.
The block containing the melody (musical notation) must be created as
ew voice="foo". The block containing the lyrics must also contain the command \set associatedVoice = #"foo". ”