I second "Ballroom Blitz", also nominate "Dude Look Like a Lady" and "Walk this Way" from Aerosmith, "Seems to Me" from the James Gang, "Paradise City" from GNR is a must, and for those pensive moments, "September Rain" and "Sweet Child of Mine", can't forget Alice Cooper, with the classic, "I'm Eighteen" and more recently, "Poison"--

To me, the characteristic elements of headbanging music are the beat, either a throbbing duh-duh-duh-duh on the toms, or a boom-BAH boom-BAH on the snares, the guitar, with has to be sustained chords with a lot of distortion, and an inane hook line that can be screamed atonally along with the recording--

Nother great thing about headbanging music is that the bands like to get out the acoustic instruments and play slow ballads every once in a while, such as "Every Rose has it's Thorn", and Alice's "Every Woman has a Name"--

Almost forgot, though it is alternative and not metal, "Girlfriend in a Coma" is great fun, and much loved(though alternative fans and metalheads tend to hate each other)--