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Auditive Materials for Teaching Mathematics
Some patterns of numbers are easier to grasp through the auditive channel for blind and sighted people alike. Misaki Yoshitake, a Japanese mathematics teacher for visually impaired students, shows this by his musical version of the rational numbers, that, with his kind permission, I can provide here for download.
Take the number
It has a period of 6 digits. Its periodicity is easily perceived both auditive and visually (by looking at the digits).
The period of 20 digits is very difficult to see with your eyes, but if you listen to the musical version, it only takes a few repetitions and the pattern emerges.
On the Homepage of Misaki Yoshitake there are more pieces to download, on Pi and on scientific topics among others.