Male roles:
CAT:
Baritone/Lower Tenor (estimate).
Should be a bit acrobatic. Has lots of energy. A fun role. In the recent scripts, they cut the song "A Day For The Cat in the Hat." That musical number required that the Cat do a lot of acrobatic tricks, he also jumped and did other tricks, such as balancing a chair on his chin. This number may have also been cut in your show. Depending upon your budget, you may fly as the Cat, so they might look for someone lighter in weight.
The Cat is more of a "host" to the show. He interects with the audience, immitates "Sally," an auctioneer, a Circus Ringmaster, and a Russian doctor. Honestly, the role should be played by someone who is a good dancer. The dancing isn't as hard as ballet, it is just a lot of movement and timing and lots of energy.
HORTON THE ELEPHANT:
High Baritone (guess)
Horton the Elephant doesn't really move a lot on stage, but he sings great songs and its just an awesome role. He believes there are people living on a dust speck, which landed on a small clover...but no one believes him. He is also tricked onto sitting on an egg, but he lost his clover and fears that the Whos are dead, but he can't desert his egg, or that may die. He is the hero of the story.
JOJO
Tenor (guess)
Jojo is a young kid who gets thrown into the Seuss stories. He "thinks too big" and so is sent to military school, where they are at war since the enemy eats their bread butter side down. He sings great songs as well. He dances, and depending upon the budget, flies.
WICKERSHAM BROTHER
Three brothers, a base, a baritone, a tenor.
They are monkeys. They dance around, they make fun of Horton.
THE GENERAL
High base (guess).
He is the leader of the military school Jojo is sent to. He is in two or three musical numbers, and about 5 scenes. He gets a lot of laughs. He criticizes one of the kids for not being able to color within the lines. No dancing, just marching. Listen to his songs on the CD.
You might want to go towards this character if you can't really dance.
CHORUS
Two choruses, me thinks. One is the Who Chorus. They are the Whos who live on the dust speck on the clover. They sing a lot, no dancing.
Other Chorus is many characters, all sing, of course, mostly all dance.
SEUSSICAL is a very touching musical and it is a shame that the show got its act together late in its Broadway run. The first National Tour with Cathy Rigby just was a HUGE improvement over the Broadway run.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle