On Earth day (April 22nd) The Giving Tree Band, known as "Greenest band in the land," according to Mother Earth News, will put their previous two album on “Fire Sale” and donate 50% of the proceeds to Global Green USA. The band is also performing at University of Chicago's Earth Day Festival on the 23rd. Here is how the fire sale will work, on the 22nd the albums Unified Folk Theory (2007) will sell for $4.99, and Great Possessions (2009) for $3.99, or both for $6.99 (51 tracks total) exclusively via the band’s website. Currently you can download two tracks for free from their site to hear what the band sounds like if you aren’t familiar with their down-home bluegrass sound.