As Adrienne LaFrance writes,
It's an interactive map that lets you tune into any one of thousands of radio stations all over the world in real time. Exploring the site is both immersive and a bit disorienting—it offers the sense of lurking near Earth as an outsider. In an instant, you can click to any dot on the map and hear what's playing on the radio there, from Miami to Lahore to Berlin to Sulaymaniyah and beyond.
...Radio Garden allows you to travel not just through space, but through time—or at least time zones. So when it's 5:08 a.m. in Nome, Alaska, and the local radio station is playing "Mercy Came Running,"—a song by the Christian trio Phillips, Craig and Dean—it's also 5:08 p.m. in Moscow, where Haddaway's 1993 hit "What Is Love" is on the radio.
At the same time—as in literally at the same time—you might find Bruno Mars's "Grenade" playing in Rome, where it's 3:08 p.m., and Billy Idol's "Dancing With Myself" playing in Honolulu, where it's 4:08 a.m, and The Talking Heads's "Wild Wild Life" playing in Buenos Aires, where it's 11:08 a.m. (That's in addition to all the songs in languages other than English playing everywhere from Ghana to Egypt to Mexico.)