Lawrence´s Barbeshop Quartet
Phineas and Ferb discover a disc of the group "The Druelselstein Experience" and His father tells them like what happened when he had 16 years old and traveled with the teacher, McGillycouldy (Unfair Science Fair) to Druelselstein where they formed a barbershop quartet with Heinz and Roger Doofenshmirtz.
While Doofenshmirtz tells to Perry his own version of the history with the problems that caused the dissolution of the group (principally the discussions between Doofenshmirtz and his brother). In the final credits, When the story ends the Whole group re-joins in " Evil Doofenshmirtz INCORPORATED " to sing once more time.
"Baby on Board"
The "Too Young line"
Ms Doofenshmirtz: Aren't you little old to be in a group.
Heinz: No I'm not.
Evil Doofenshmirtz Inc
Dr. Doofenshmirtz and his group re joins in Doof´s house to sing again (We can see Vanessa Doofenshmirtz and Candace with a T-shirt that says: "They aren't my family"
- All the episode and songs is based in the Simpsons episode "Homer´s barbershop quartet"
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Dan Povenmire as Doofenshmirtz and Doofenshmirtz´s father
- Dee Bradley Baker as Perry
- Unknown Voice as McGillicouldy
- Jeff "Swampy" Marsh as Major Monogram
- Unknown Voice as Ms Doofenshmirtz
- Richard O´Brian as Dad
- John O´Hurley as Roger
- Charlene and Vanessa appears but they don´t speak