You know the “jam face,” that nether region of expression the squeezes in somewhere between eternal ecstasy and taking a dump. Well, RollingStone.com has compiled the quintessential list–and made names for–ever species of jam face you could possibly imagine.

Everything from Neil Young’s “Defiant One” to Billy Corgan’s “Vampire Bat.” There’s a full 22 new faces and names to memorize. So do your homework–there will be a quiz.

 Check out Rolling Stone’s “Field Guide to Guitar Jam Faces” here!

[Props to Gorilla Mask for finding this one]

(image source: RollingStone.com)