Use "self adhesive" hooks. There is one brand that removes easily, made by 3M, can't remember it's name though.
Duct tape!
It's complicated, but you have to make a relay (SSR) that connects to the output of the stereo, and connect the lights to the relay. Heres a website that shows how to do...
yes, they will they will have it a few days after christmas
I think it'sjust commercialized. But if you really need a religious answer, they probably represent the North Star guiding the shepards.