Looking for math audio resources online It is pretty difficult to find advanced math lectures online, though, with some effort, one can find a few (by "advanced" I mean anything beyond 1st or 2nd year of college, and preferably aimed at mathematicians, rather than engineers or scientists).  The difficulty of this search becomes orders of magnitude greater if one is looking for audio-only lectures (that can be easily readily played in an mp3 player).  Of course, much of this has to do with the fact that it is difficult to communicate math without visuals, although it is definitely possible.
Does anyone know of any such resources (preferably free) online?
Thanks!
PS: one could, with considerable additional effort, extract the audio from, say, math video lectures on YouTube or iTunes, but I'm not too keen on this option, and not only because of the work involved.
 A: http://www.extension.harvard.edu/open-learning-initiative/abstract-algebra
Abstract Algebra from Benedict Gross at Harvard University.
A: Yes, there is a great resource containing tuns of stuff of the exact kind you are looking for ! Check out Itunes University, most major US schools and many of the top European ones have whole lectures series uploaded there, and they are available for free to download in many cases both audio and video.
A: Advance mathematic courses are freely available at http://ocw.mit.edu/courses/#mathematics 
Regards,
Arif
A: There is several audio http://www.openculture.com/math_free_courses
A: I found the answer to my original question in this excellent Math Overflow post:
https://mathoverflow.net/questions/2507/mathematical-podcasts-audio
A: I wrote a book called Math Fundamentals for Audio which you can find here: https://www.areditions.com/gaston-bird-math-fundamentals-for-audio-das027.html
A: Check out http://www.redhoop.org/search/?q=math. These are all online courses. Not sure how advanced they are though
