def _simplify_note(note):
    """Unify references to bass drum, snare drum or ride cymbal."""
    if note.value == 35:  # Bass Drum 1 -> Bass Drum 2
        note.value = 36
    elif note.value == 40:  # Snare Drum 2 -> Snare Drum 1
        note.value = 38
    elif note.value == 59:  # Ride Cymbal 2 -> Ride CYmbal 1
        note.value = 51
    return note