(make-music
  'EventChord
  'elements
  (list (make-music
          'NoteEvent
          'duration
          (ly:make-duration 0 0 1 1)
          'pitch
          (ly:make-pitch -1 3 0))
        (make-music
          'NoteEvent
          'duration
          (ly:make-duration 0 0 1 1)
          'pitch
          (ly:make-pitch -1 5 0))
        (make-music
          'NoteEvent
          'duration
          (ly:make-duration 0 0 1 1)
          'pitch
          (ly:make-pitch -1 1 0))))