It is not allowed to use the "override" command within a chord; if you're working with lilypond 2.8, you can use the "tweak" command. Your example will work this way:
<bes \tweak #'color #blue g>4
The old pre-tweak way would have been to create the chord with different voices and line up the notes manually into a chord.
Using: \override NoteColumn #'force-hshift = #0.0 within different polyphonic lines.
Stephen
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