In 41 flavors (colors) large & small. I use a small handful of audio formats, and since lots of apps which like to stake claim on them do not give them different icons, I wanted some I could use to easily ID different codecs.
I also use them in DOpus and Foobar2000.
Here's a 127x127 png, fairly grayscale, if you would like to make your own colors.
Thanks to Zippo for the xml maker for .dis files!