Audio Compression

http://en.wikipedia.org/wiki/Audio_bit_depth
http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/mp3/index.htm
http://blog.bjrn.se/2008/10/lets-build-mp3-decoder.html
FAQ: http://mpeg.chiariglione.org/faq/mp4-aud/mp4-aud.html