ACT I
"Oh, The Thinks You Can Think!"
Cat, Boy, Full Company
"Horton Hears a Who"
Cat, Boy, Horton, Bird Girls, Ensemble
"Biggest Blame Fool"/"Biggest Blame Fool Playoff"/"Gertrude McFuzz"
Sour Kangaroo, Young Kangaroo, Horton, Wickersham Brothers, Bird Girls, Gertrude, Mayzie, Cat, Ensemble
"Here On Who"
Horton, The Whos
"How to Raise a Child"
Mr. Mayor, Mrs. Mayor
"Oh, The Thinks You Can Think! (reprise)"
Cat, JoJo
"It's Possible"
JoJo, Cat, Ensemble
"Alone in the Universe"
Horton, JoJo
"The One Feather Tail of Miss Gertrude McFuzz"
Gertrude
"Amayzing Mayzie"
Gertrude, Mayzie, Bird Girls
"Amayzing Gertrude"
Gertrude, Bird Girls, Cat
"Monkey Around"
Wickersham Brothers, Horton
"Chasing the Whos"
Wickersham Brothers, Horton, Sour Kangaroo, Young Kangaroo, Cat, Bird Girls, Ensemble, Whos, Vlad
ACT II
"Notice Me, Horton"
Gertrude, Horton
"How Lucky You Are"
Mayzie, Cat
"Mayzie's Exit" / "Horton Sits on the Egg" / "Dilemma" / "Hunters"
Horton, Gertrude, Bird Girls
"Egg, Nest, and Tree"/"Sold"
Sour Kangaroo, Young Kangaroo, Horton, Hunters, Bird Girls, Ensemble
"Mayzie in Palm Beach"/"Mayzie at the Circus"
Mayzie, Cat
"Amayzing Horton"
Mayzie, Horton
"Alone in the Universe (Reprise 1)"
Horton
"Solla Sollew"
Horton, Mr. Mayor, Mrs. Mayor, JoJo, Ensemble, Whos
