The most common sound is from "eet caay" people who walk the streets towing carts looking for recyclable trash. They make squeaky little horns out of empty dishliquid bottles which they squeeze as they walk along to notify people to bring out their recyclables. Matt tells me they used to yell out "eet caay" all day as they walked along, and though I've heard that occasionally, these days the horns make it so yelling isn't necessary. I can't imagine how hard it would be to tow that cart all day long in the heat. A lot of times a cute little kid is along for the day in the back of the cart with the trash. They are very poor people.
Another sound I hear quite often is the Cambodian equivalent of the ice cream truck--the ice cream motorcycle with an attached cooler. As far as I can tell, all ice cream vendors in Phnom Penh play the same tune.
