| Playable range for this instrument.
playableRange     :: Instrument -> Ambitus Pitch
playableRange = Data.Maybe.fromMaybe (error "Missing comfortableRange for instrument") . Data._playableRange . fetchInstrumentDef

-
playableRange     :: Instrument -> Ambitus Pitch
playableRange = Data.Maybe.fromMaybe (error "Missing comfortableRange for instrument") . Data._playableRange . fetchInstrumentDef
playableRange = Data.Maybe.fromMaybe (error "Missing comfortableRange for instrument") . Data._playableRange . fetchInstrumentDef