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12.8.4.6. Polyphonic Sections of Homophonic Music

Sometimes, especially in piano music, a passage of some measures will require polyphonic (multi-Voice) notation in LilyPond, even though most of the music does not. In this case, you would use the following format: << { % upper voice notes go here } \\ { % lower voice notes go here } >> This is used a few times in both hands in the example score file.
When writing these sections in "relative" entry mode, it is a good idea to use the "octave-check" mechanism, at least at the beginning of the lower voice. This is because, when judging the relative starting pitch of the first note of the lower voice, LilyPond judges from the last note of the upper voice - not the last note before the polyphonic section began.