Wait, hang on -- isn't the theme to HBO's Game of Thrones completely instrumental? Indeed it is, but that didn't stop a select number of the show's cast from trying to sing it... even if it ends up as a series of "duns", "dees" and "las".
Esme Bianco (Ros), Maisie Williams (Arya Stark), Lena Headey (Cersei Lannister) and Michelle Fairley (Catelyn Stark), among others, get into it (or, at least, try to). It's a shame they don't try and come up with actual lyrics, though I myself have no idea what form those words would take and you'd be hard-pressed to come up with something on the spot... unless you're Flight of the Conchords, Axis of Awesome or Tripod.
Video: MTV Geek