Reply #2: Grammar and other minutiae about the English language.

[WritingIsMyReligion]

Also most things about jazz music or music theory, especially jazz history dealing with the '50s or so onwards, most especially of that Miles Davis.

If it's fairly mainstream rock/soul music from the 1960s and '70s, I can in some cases quote artist, title, year released, album, track number. :D I'm hot with classic rock lyrics, too, at least all the radio songs, and some select album tracks from various artists.

I'm sure there's more...