Songs
Act I

Oh, the Thinks You Can Think
Full Company
Horton Hears a Who
Horton, Bird Girls, Citizens of the Jungle
Biggest Blame Fool
Sour Kangaroo, Horton, Gertrude, Mayzie, Yertle, Cat
Here on Who
Mayor, Mrs. Mayor, Whos, Grinch, Horton
Oh, the Thinks You Can Think, Reprise
Cat, Jojo
It's Possible
Jojo, Cat, Fish
How to Raise a Child
Mrs. Mayor, Mayor
The Military
Schmitz, Cadets, Cat in the Hat
Alone in the Universe
Horton, Jojo
The One Feather Tail of Miss Gertrude
Gertrude
Amayzing Mayzie
Mayzie, Gertrude, Bird Girls
Amayzing Gertrude
Gertrude, Bird Girls, Cat
Monkey Around
Wickersham Brothers
Chasing the Whos
Sour Kangaroo, Bird Girls, Wickersham Brothers, Cat, Horton
How Lucky You Are
Cat
Notice Me, Horton
Gertrude, Horton
How Lucky You Are (Reprise)
Mayzie, Cat
Act I Finale
Horton, Gertrude, Cat, Jojo, Whos, Bird Girls, Ensemble

Act II

Egg, Nest & Tree
Sour Kangaroo, Bird Girls, Wickersham Brothers, Ensemble
The Circus McGurkus
Cat, Circus Members
The Circus on Tour/How Lucky You Are (Reprise)
Horton, Cat, Circus Members
Mayzie in Palm Beach
Mayzie, Cat
Amayzing Horton
Mayzie, Horton
Alone in the Universe (Reprise)
Horton
Solla Sollew
Horton, Circus Members, Jojo, Mayor, Mrs. Mayor
Green Eggs and Ham II
Cadets, Schmitz, Jojo
Into the Whos' Christmas Pageant
Whos
The Grinch Carved the Roast Beef
Grinch, Whos
A Message from the Front/Solla Sollew (Reprise)
Cadets, Schmitz, Mayor, Mrs. Mayor
Jojo Alone in the Universe
Jojo
Havin' a Hunch
Cat, Hunches, Jojo
All For You
Gertrude, Cat, Bird Girls, Horton
The People Versus Horton the Elephant
Full Company
Yopp!/Alone in the Universe (Reprise)
Gertrude, Horton
Finale - Oh, the Thinks You Can Think
Full Company