Madonna Releases Track Online  5/20/07

Click here for Madonna Ringtones

Madonna has released her new song Hey You online - and the first million downloads are free.

The Material Girl - who is headlining the London leg of this summer's (07) Live Earth series of concerts - has teamed up with hip-hop star Pharrell Williams for the ballad, in a bid to raise awareness about the effects of climate change.

But the duet doesn't specifically talk about global warming - instead the lyrics refer to loving and saving each other.

The track is available on MSN.com, and Microsoft have pledged to donate 25 per cent of each download to the Alliance for Climate Protection.