Radiooooo is one of the coolest music sites around. You can click a country on a world map and then click a decade from the past 120 years, and it will then play music from that area and from that time period.
You can develop a list of “saved” songs, but I wasn’t able to figure out if and how you could share them.
It’s a great addition to The Best Sites For Learning About The World’s Different Cultures.
Thanks to Google Maps Mania for the tip.