The Poompa Boompa Quartet

The Poompa Boompa Quartet is a group of four Poompa Boompas who sing songs in the manner of a Barbershop Quartet at Charlie Chunka Chocolate Inc. They are described by Charlie Chunka to be the musical geniuses of the factory, and have written most songs that the workers of the factory sing, including the ones that Mr. Chunka sings himself. They also seem to sing everything they say.

Roles
Each member of the quartet wears a typical striped suit that all barber shop quartets wear, although each member's suit has different colored stripes. The colors differentiate what type of singing voice the member uses, as seen below:
 * Yellow - Alto
 * Red - Soprano
 * Green - Baritone
 * Blue - Bass

During Phineas & Co's Tour
The quartet is seen numerous times throughout the tour Mr. Chunka gives Phineas, Ferb, and all their friends in the "Phineas, Ferb, and the Chocolate Factory", either dancing in the background or singing occasional songs. Their most prominent role in the episode is dismissing characters who get kicked off the tour, and at the same time singing a song with a lesson in the lyrics.