First of all, I've always imagined French as the official language of the apocalypse - like the Olympic Games or Eurovision - so my choice would have to be a French-based. Also, the way I see things happening (the world ending, all on fire, yadda yadda yadda) it's a gradual process, not all of a sudden, so it gives us enough time to panic and even laugh at the whole thing; this rules out all the songs that are too dramatic because hey, we're soundtracking an apocalypse here, not the next epic Hollywood feature. Jacques Brel's 1959 song 'La Valse à Mille Temps' is a parody of chanson itself, of the very essence of the musetta's waltz; it starts with a slow, simple 3/4 tempo that gradually increases until an absolute whirlwind has been created and, before you've even noticed, there's nothing left.