This is a submission based on the pig zodiac (which is mine). It's based on the racing origin of the zodiacs where the pig finishes last (becomes 12th year) due to sleeping halfway through the race. To express this, I made this song to represent the pig sleeping while everything else is happening.
As for the sound effects, they also represent parts of the myth. The rain represents the dragon making rain to aid a village, the gallops represents the horse galloping by with the snake (the pig's zodiac opposite) clinging on to one of the horse's legs represented by hissing, the wind for the dragon also providing wind to help the rabbit across, and the oinks (snores) representing the pig sleeping through all of it.
The last few measures represent the pig waking up after everything passed and continuing on.