posted on Aug, 28 2009 @ 10:33 AM
Megadeth has Hangar 18, and the sequel to it, Return To Hangar.
This thread bugs me, because now I know I've heard tons of songs about the subject, but none are coming to mind
a Metal band called Agent Steel has an entire album devoted to aliens titled Alienigma.
I also would mention Ziltoid The Omniscient by Devin Townsend, but the member with the same name beat me to it
However, I highly recommend checking that one out if you haven't already.