| Convert an instrument to a MusicXML Standard Sound ID.
-- If the given instrument is not in the MusicXMl standard, return @Nothing@.
toMusicXmlSoundId :: Instrument -> Maybe String
toMusicXmlSoundId = Just . soundId
--
toMusicXmlSoundId :: Instrument -> Maybe String
toMusicXmlSoundId = Just . soundId
toMusicXmlSoundId = Just . soundId