I'm not going to fucking war to die because some rich fucks were idiots. I'm bunkering up at my place with my friends, adding fortifications, and getting as self-sufficient as possible while lending a hand in our community where we can.
Pic related with thunderbolt to help with power and take down any air strikes, watergun for close range attacks and proving water for various uses, it can open up a fissure just beyond the walls to form a mote to keep out any ground forces and lob mub bombs at them while I shoot down through the arrow slits. Not even one of my favorites, but it'd be useful and easy to care for.
Looping music gets old real fast outside of video games and even then that only works because you're not typically in a situation where you're going to be listening to the same track continuously for very long. Not really a battle anthem, but if I'm putting any one song on repeat I think I'd last longest with my favorite before losing my mind:
https://youtu.be/l8_j7y1U5QoIf I'm allowed to queue up music like a normal person then I'm running through Manowar's discography during a siege.