Which of those isn't a music file? I couldn't find any. Admittedly I didn't go through the full 213,000 hits.
Or did you mean to point out that "filetype" is a search option, albeit one of the "you don't know unless you know" group? Interesting that the named files in the search results (second row, green on my browser) are .midi but the clickable links (top row) go to the page. No audio equivalent of hotlinking-- at least not yet.
Incidentally I just met another one: Preview downloads .ttf (font) files even though it doesn't use them. I have them in one directory's headings, so you can tell even at micro-preview-scale.