Taking inspiration from the opening sequence of Contact, lightyear.fm is a musical journey away from the Earth. As you get farther out (say, 10 light years away, just past star Ross 154 in the constellation of Sagittarius), you hear music that was broadcast on the radio at that time (Gold Digger by Kanye West).
Radio broadcasts leave Earth at the speed of light. Scroll away from Earth and hear how far the biggest hits of the past have travelled. The farther away you get, the longer the waves take to travel there — and the older the music you’ll hear.
This is the coolest.