Where do I find good new songs?

I get my new music fixes on satellite radio. I prefer the garage bands on Little Steven’s Underground Garage on Sirius, and my wife likes the two “alternative” stations on there, Left of Center and Alt Nation. We heard stuff on those channels last year in March that made it to commercial airplay about six months later.

The short answer: Public Radio

World Cafe
All Songs Considered
Morning Becomes Eclectic