Giving away music for free doesn’t seem like the way to run a business, but from Spotify to Qtrax enterprising industry businessmen are lining up to do just that. Guvera is an Australian based site that allows users to download music for free in exchange for viewing advertisements. Guvera has the backing of the big four labels and is poised to make its US debut at the end of March. Guvera is likely to face stiff competition. Spotify is eying a US launch, and rumors persist that Apple may be taking its music service to the cloud. Who comes out on top remains to be seen, but clearly the music industry can’t support countless ad supported music distribution sites.