Comment by squigz
Muzak but specifically for blind people!
Such an engineer's solution. :P
The glaring issue here would be standardization. Either every place uses the same sounds, or you have to learn a new system for each place you visit using this sort of thing. This is also why you couldn't change notes regularly, which would be boring and repetitive for everyone else.
The same instruments should be used for the same things everywhere. Yep. This is the idea.
Or at least to navigate a complex multistore building with a lot of repeated elements. I wonder if a videogame could be designed as a soundgame for blind people replacing images by sounds.