HN user
I hoard the information I have actually read (sometimes even stuff I did not read thoroughly) into my own, personal, searchable version of the internet, so that I can easily refer back to it, retrieve an old article and share it.
To do that I use a paying account of pinboard.in
Well, I went into the source code and indeed it was mimetypes in the source. It seems just a typo that went in when writing the post.
Was I the only one surprised with the variable minetypes: ['application/x-php'], focus on minetypes instead of mimetypes.
I guess they have a reason for keeping it that way, although if such a typo exists unfixed in the codebase, that gives you a general hint of the overall codebase quality.
While an interesting technique and premises, there are yet some oddities. Such as Beethoven in the middle of Rock songs (http://i.imgur.com/HgwuREl.png), I guess there are others.
I wonder how this would compare with Apple Genius, which I never used.