Ha!
[That's just a touch too poetic for Jack - though he can see how such lyrics might appeal to the poet in Spike - but it does sound vaguely familiar, and he squints at Spike's back as he follows him out the door.
Then it comes to him, and he groans because, really, what could be more appropriate for Spike?]
Oh! Sex Pistols, right? [He may not have had much time for popular music, but some songs just get played a LOT and God Save The Queen is one of them.]