Music and Sound

Yesturday I met up with my sound guy to discuss what I want for the animation.
He seemed to understand what I wanted which opening up with a cheesy 60's alien invasion theme
(e.g. The opening theme for "the day the earth stood still, https://www.youtube.com/watch?v=3ULhiVqeF5U)

He mentioned doing the sound effects should be no problem and seemed to be really emthusasitc about doing them which is good given the sound effects is probably going to be the thing which will make or break the animation.
Trying to get the idea of what ambient music I want was rather difficult, I wanted something mysterious and yet tranquil but changes up when the first alien dog is in the shadows and again for the gaint monster. The only example I could find was this (starting from the 14 min mark https://www.youtube.com/watch?v=ZKfgP93FjCc)