| Standard clef used for this instrument.
standardClef      :: Instrument -> Maybe Clef
standardClef = Data.Maybe.listToMaybe . Data._standardClef . fetchInstrumentDef
--
standardClef      :: Instrument -> Maybe Clef
standardClef = Data.Maybe.listToMaybe . Data._standardClef . fetchInstrumentDef
standardClef = Data.Maybe.listToMaybe . Data._standardClef . fetchInstrumentDef