I'll happily second this. I've been a big fan of Earth Mantra since its inception, and though I haven't kept up on all the releases, I've listened to a lot of them. There's a ton of good stuff here, and it's all free. The ones I'll recommend most are Lucette Bourdin, Arcticology, and Phillip Wilkerson. And there's the guy who started it all, Darrell Burgan, who records under the name of Palancar. His music is worth checking out as well. There's plenty here to keep anyone busy for a while.