It includes a huge number of children, too. The show this year has more than 100 students in it, with at least one representing each school in the Burbank Unified School District, Bishop said.
There are also about 20 adults are in the cast, including Brendan Jennings, show choir director from John Burroughs High School.
Jennings and Burbank High show choir director Brett Caroll have put competition aside to work on the show. Caroll is playing the piano for the show and doing some of the orchestral directing.
"It's fun actually," said Jennings, who will playing the role of Horton the elephant who sits on a big, red egg in a nest for most of the show.
"It's nice to have a different perspective and it's also nice to be in this show while [Caroll] is doing all the work. I'm on vacation while he's still at work."
Students twirled around on stage and warmed-up their voices while other cast members sat in the audience waiting for their turn to take the stage.
A couple of girls in brown clothes and bright yellow tutus surveyed the seen on stage and chattered with each other.
"I'm a little nervous because I've never put on a show like this," said 18-year-old Nora Davis, of Los Angeles. "Like, a big musical. But I definitely think it will come together."
Sprinkled with veterans and new comers, the show will play at the Alex Theatre in Glendale.
The last time Showcamp performed at the Alex Theatre was in 2003 when campers performed "Joseph and the Technicolor Dreamcoat," Bishop said.
The show, which runs Thursday through Sunday, will also mark one of the rare occasions that Showcamp students have performed a production that was not originally concocted by it's directors, he said.
Students, as well as parents and Showcamp volunteers, contributed to every aspect of the production, including the set design, he said, to get the show up to snuff for the 1,463 seats they hope to fill at the Alex Theatre.
Despite it being the first time many of the students would perform in front of a potentially large audience, the rehearsal was filled with laughs and light-hearted turns.
"Hey, Philip," shouted 12-year-old Tierney Bent, of Burbank, at Philip McNiven, whose trademark red-and-white-striped stovepipe hat had flopped over. "Philip, fix your hat."
McNiven popped the top of the hat back up and grinned at the assortment of children giggling at him. He then proceeded to high-step around the stage while Caroll played piano and Horton sat on his egg.
Tickets for "Seussical the Musical" are $20 to $25 for adults, $15 to $20 for seniors, students and children.
To purchase tickets, call (818) 243-2539 or visit www.alextheatre.org.