Quite a lot of people are not careful with their computer and manage to get a program installed on it that they are not aware of, or they are aware of it, but don't know what it really does.
Read the rest of Zombie networks, comment spam, and referer spam.
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I know this article is over 2 years old, but I recently did a whois search for guitar-chord-helper.com and found Ilya Burkaltsev as the registrant.
The site matches the format you described above. I was initially confused, because a link to one of the "guitar tabs" is just a link to my personal blog.