The Greensingers are a Druidic Tradition that is mostly found in the Eldeen Reaches and Aundair, particularly around Thelanis manifest zones. They are ambassadors to the Fey, and believe that the magic of the fey enhances and compliments nature, that they are as much a part of the natural world as the beasts and the trees.
Greensingers encourage relations with the fey, and teach mortals how to safely interact with the fey. Greensingers may be found anywhere that you can find the fey, but they are mostly found in the Twilight Demesne in the Reaches, and among the many Thelanis manifest zones in Aundair. Many of the Greensingers are bards and druids, but most of their number are simply ordinary people that have learned the stories of the local fey and follow their traditions, living in harmony with their fey neighbours.
Greensingers are the most likely of the Druidic Traditions to awaken animals and plants, just to bring more magic into the world.