The Harpers were a semi-secret organization dedicated to promoting good, preserving history (including art and music of old) and maintaining a balance between civilization and nature by keeping kingdoms small and the destruction of animal and plant life to a minimum. They considered the elven empire of Myth Drannor shortly before its fall to be the pinnacle of civilized history and strove to recreate the world in that image.
Those Who Harp have disbanded several times, but after each time they eventually reformed one way or another.
Membership
Most members were either good/neutral-aligned rangers or bards, though many wizards and druids were also their willing allies.
The Harpers were led by a council of High Harpers, who were responsible for most of the group's long-term plans and goals. High Harpers were elected through the means of secret ballots among the other High Harpers, with the criteria being long time service and extreme discretion in the implementation of their plans.
The Harpers operated mainly in the North Faerûn, along the Sword Coast, the Western Heartlands and the Dalelands. The group itself was extremely decentralized and the nearest thing they had to a base of operations was Twilight Hall in Berdusk. An often employed means of achieving their goals was assisting adventurers who were on quests that would further Harper interests.
In the 15th century DR, the Harpers became active across all of Faerûn.