So after Dipper sang "Sad Songs" on the spur of the moment, Birch realized that Dipper had hit on something. They *had* been dwelling in misery, and it was time for them to perk things up a bit.

After attempting to get Dipper and Stargazer to sing the Oogah Chakka's and they simply could not get the rhythms right, he brought in some professional friends to do it.

So, here it is.