This is in addition to many other codecs supported in software and you can purchase licenses from the Raspberry Pi Store for MPEG-2 and VC-1 hardware decoding for just a few bucks.
Mr. Blake derived a simple melody by playing a few dozen digits of pi using a C-major scale, with 3, 1, 4, 1, 5, 9 translated to the notes E, C, F, C, G, D and so on.