Home / Forums / General melodica discussion / Suzuki M 37C Voice Range / Reply To: Suzuki M 37C Voice Range Reply To: Suzuki M 37C Voice Range February 24, 2017 at 4:57 pm #8298 Paul DurhamParticipant Treble clef music will be fine. Ledger lines can be used for all the note below (F BELOW middle C) for alto voice and the lines above the staff for the soprano note through F3.