Coloring elements of notation

Individual objects may be assigned colors. Several pre-defined colors are available; they are exhaustively listed in the Notation Reference.

\version "2.24"

\relative c'' {
  \override NoteHead.color = #red
  c4 c
  \override NoteHead.color = #(x11-color 'LimeGreen)
  d
  \override Stem.color = #blue
  e
}