From Muppet Wiki

The Glory Song is the most important song for the Fraggles. Each generation of Fraggles has their own Glory Song that is sung their entire cycle in the cave. It is the Storyteller Fraggle's assignment to announce who will write the Glory Song, and does so by pulling the Fraggle's name from the Gord of Guidance. The Fraggle selected must write the song on their own.

Gobo's Glory Song saved the lives of the Ditzies in one episode of Fraggle Rock