ACT I
Oh The Thinks You Can Think
The Cat, Boy
Horton Hears a Who
Cat, Boy, Horton, Bird Girls, Jojo, Jungle Creatures
Here on Who
Mayor, Mrs. Mayor, JoJo, Horton, The Whos
How to Raise a Child
Mayor, Mrs. Mayor
Oh The Thinks You Can Think (reprise)
Jojo, Ensemble
It's Possible (Pt. 1)
Jojo, The Cat, Fish
It's Possible (Pt. 2
Jojo, The Cat, Fish
Alone in the Universe
Horton, Jojo
The One Feather Tail of Miss Gertrude McFuzz" / "Amayzing Mayzie
Gertrude, Mayzie, Bird Girls
Monkey Around" / "Chasing the Whos
The Wickershams, Sour Kangaroo, The Cat, Horton, Bird Girls, Jungle Citizens, Whos
Mayzie's Exit" / "Horton Sits on the Egg" / "Dilemma" / "Hunters
Horton, Gertrude, Bird Girls
ACT II
Amayzing Horton
Mayzie, Horton
Solla Sollew
Horton, Mr. Mayor, Mrs. Mayor, Jojo, Circus Animals
All for You
Gertrude, Bird Girls, The Cat
The Whos Return"
Horton, Mr. Mayor, Mrs. Mayor, Jojo, Gertrude
YOPP!
Sour Kangaroo, Young Kangaroo, The Cat, Mr. Mayor, Mrs. Mayor
Oh, the Thinks You Can Think! (Finale)
Jojo, Full Company
Green Eggs and Ham (Finale Bows)
Full Company