If you are a fan of iTunes on Facebook you can frequently get free downloads. Right now they are offering a FREE Lollapalooza 2010 Sampler. This collection features 10 free songs from artists performing at this year’s festival including Company of Thieves, Rebelution, Minus the Bear, Rogue Wave, and many more.
The 2010 Warped Tour sampler is also still available. They also have a free single for downloading every week.
I know some of this music may not be for everyone, but I have found several bands that I quite like, bands that I may not have known about otherwise.