If you haven't heard about the Raging Grannies, now is a great time to begin your appreciation for them. They started in 1986 and have 'organized groups' around the world. They typically sing protest songs about social and environmental injustices. Learn more about them here and here.
I came across the Albuquerque Raging Grannies when Surfrider was organizing for the Hand Across the Sand event. They sent me an email with a link to their song and said:
"We're 800 miles away from the nearest beach, but we want to offer our encouragement! Please feel free to use our song at your demonstration. It's the to tune of "Blowin in the Wind" which everyone knows and is a real crowd-pleaser"!