I like some peaceful ambient noise when I work. I particularly like bird sounds.
Recently I found this site from Haagen-Dazs that has a wonderful forest soundtrack. I open a tab in my browser and just keep it on this page all day so I can hear the birds.
This site is a fund-raising site for honeybee research. Honeybees are in trouble, which is bad news for anyone who eats.
See this NYT article about it:
Haagen-Dazs is trying to raise money to try to figure out why the bees are dying, and that's what the site is for.
I used to use this site:
which isn't bad either, but the bird sounds don't echo as much, and somehow it feels slightly less like a real forest.