import abjad

chord = abjad.Chord("<a' d''>4")
abjad.tweak(chord.note_heads[-1]).color = 'grey'
staff = abjad.Staff([chord, abjad.Rest('r4')])

scale = [abjad.Note(x) for x in ("a'8", "b'8", "c''8", "d''8")]
staff.extend(scale)

abjad.attach(abjad.TimeSignature((2,4)), staff[0])
abjad.show(staff)