This is not something I’d use, but it seems a rather a useful and wonderful creative app. PhotoScore scans the musical score from printed sheet-music, recognises it, and can play it back as music or export the notes to other software. I predict a “Google Score” search-engine in future years, as an adjunct to Google Books, that scans all the out-of-copyright sheet music in the world, and then not only lets you see it, but hear it too — and then download the notes for use in your music creation software.