Madonna: Live Earth Concert at London(2007)

Madonna released the song "Hey You" for the Live Earth series of concerts. The song was available as a free download during its first week of release. She also performed "Ray of Light", "La Isla Bonita" (with Eugene Hütz and Sergey Ryabtsev of Gogol Bordello) and "Hung Up" at the London Live Earth concert too.

Official site