Trying to memorize a Chinese song.

I let myself get roped into performing a song for some competition involving foreigners in Wuxi. I decided, without thinking, to perform this Chinese pop song about mice eating rice (Lao Shu Ai Da Mi). The song seemed simple enough. But now that I am up against it for time, (I will perform the song on Saturday night), I find I can't memorize the song perfectly. I am trying to memorize a bunch of sounds that I can't find the logic to. Agonizing.