This is a neat idea, and I can see a place for a different notation for all instruments to make music easier to read for them. However, of course, this means that music for one instrument is not readable for another, this is no universal system. If perhaps this were also tied to a universal ur-system which ties together the formats for all instruments in a way whereby someone who knows one format can read other instruments' musical notation, either by reading an abstracted central version, or have an automagic system for transcribing the musics to their familiar notation, then this might be the sort of thing to be useful. However, for general musical use, a universal system is likely to be nevessary for musicians, because it makes it much easier to read anything that's lying around.