ACT I
Oh The Thinks You Can Think
The Cat, Jojo
Horton Hears a Who
Cat, Horton, Bird Girls, Jojo, Jungle Creatures
Biggest Blame Fool
Sour Kangaroo, Little Kangaroo, Horton, Wickersham Brothers, Bird Girls, Jungle Citizens, Gertrude, Mayzie, Cat
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, Cat
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
Amayzing Gertrude (Pt. 1)
Gertrude
Amayzing Gertrude (Pt. 2)
Gertrude
Monkey Around" / "Chasing the Whos
The Wickershams, Sour Kangaroo, The Cat, Horton, Bird Girls, Whos
Notice Me, Horton
Gertrude, Horton
How Lucky You Are
Mayzie, The Cat
Mayzie's Exit" / "Horton Sits on the Egg" / "Dilemma" / "Hunters
Horton, Gertrude, Bird Girls
ACT II
Egg, Nest, and Tree
Sour Kangaroo, Horton, Hunters, Bird Girls
Sold" / "Mayzie in Palm Beach
Sour Kangaroo, Horton, Bird Girls, Mayzie, The Cat
Mayzie at the Circus
Mayzie
Amayzing Horton
Mayzie, Horton
Alone in the Universe" (Reprise 1)
Horton
Solla Sollew
Horton, Mr. Mayor, Mrs. Mayor, Jojo, Circus Animals
