Epic WTF

How do you encourage bicyclists to wear only one earbud so they can
hear surrounding traffic? The radio station created songs that change
genre when you listen to them on just one headphone. Working with
Romanian artist Claudia Pavel, the radio station launched the Go Mono
Anthem. It's rock if you use the left headphone, and acoustic if you
listen with the right headphone.

http://www.mediapost.com/publications/article/285696/radio-21-gives-incentives-to-cyclists-riding-with.html