
According to Grist.com, you might be surprised at what this list of musicians do with some of their off time.
Green Day - This pop-punk trio has partnered with the Natural Resources Defense Council, http://www.greendaynrdc.com/, on a Move America Beyond Oil campaign, and have made a number of You Tube videos voicing support for environmental protection and smarter energy policies.
Jack Johnson - This Hawaiian born songster co-founded the Kokua Hawaii Foundation, http://www.kokuahawaiifoundation.org/, a nonprofit supporting environmental education in the schools and communities of his home state.
KT Tunstall - The grammy-winning artist runs her tour bus on biodiesel fuel and her affiliation with The Carbon Neutral Company, http://www.carbonneutral.com/, has enabled her and her fans to plant some 5,000 trees as offsets.
Moby - This DJ-turned-pop-star's entire musical style is about recycling -- repurposing beats and riffs from other artists into tracks of his own. A vegan, he's a big supporter of PETA and the Humane Society, and in 2002 he opened Teany, http://www.teany.com/ a vegetarian tea cafe' in New York City.
Big Head Todd and The Monsters - For the past two years, these Colorado blues rockers have used their annual Red Rocks concert to raise thousands of dollars for the Boys and Girls Club of Denver and The Rocky Mountain MS Center. This year money raised at the concert went to The Childrens' Hospital Autism Program. http://www.bigheadtodd.com/.
Linkin Park - The world famous rock band founded Music for Relief, http://www.musicforrelief.org/, a non-profit organization to aid the victims of the South Asian tsunami and has recently broadened its scope to help reduce global warming by encouraging musicians and fans to get involved with these to causes.
Grist magazine, http://grist.org/news/maindish/2007/06/22/musicians/, has a few more on their list that are worth noting, like Sheryl Crow, Pearl Jam, and Perry Farrell of Jane's Addiction.
If you ever wondered...now you know. Support bands that care.