When I first was in China this is the song I heard all the time from guys pushing around carts selling mix CDs. You see, these carts usually have stereos on them so you can hear them from a block away and run down and buy the song you just heard.
Today I hung out with a girl from Beijing and was trying to describe this song by singing it, without any words. It didn't work. The good thing is that I have it now to share with all you!