Use \new Voice \voiceOne ... \voiceTwo ...
\new Staff <<
\new Voice { \voiceOne \A }
\new Voice { \voiceTwo \B }
>>
and if you want only one note appears
use "s" for the seconde voice
1) a4
b) s8 c8
I have a question regarding single staff polyphony. When two voices
share the same pitch LilyPond (2.6.3) will show the two notes next
to each other. I would like to alter this so that only one note
appears with beams up and down. If notes have different time values,
I'd like > the note with longest duration to be shown.
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