I got the idea of using time signatures in a way to get across an idea, as the song progresses it goes through all the stages between 9/4 and 5/4 (except 8/4, cuz fug common time), the idea is that as the sun setting, the song also goes down (in time signatures).

Standard chill stuff though, no mathy craziness.
This is way too repetitive of a song for the first 40 bars, but bar 50 and on was cool, but yet again, too many repetitions.