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Just how high can you go? In the case of the Broadway musical "Jersey Boys," the sky may be the limit.

In a producing climate where surviving four seasons can be looked at as a success, "Jersey Boys" has just celebrated its fourth year on Broadway, and has set up shop in six other cities around the world.

"A friend of mine in LaJolla called and said this show could be bigger than you guys ever were, and I chuckled to myself, it was like one in the morning and said well, wouldn't that be nice," said Jersey Boys musical writer Bob Gaudio.

With gross earnings of $730 million worldwide, producers are not content to rest on their laurels, taking great strides to protect the franchise, and its franchise player.

"It's six weeks of 'Frankie Camp' and if they graduate, they are seriously considered for one of the companies and they don't always, sometimes, its a very, very difficult role and its not just a matter of having the vocal qualities and range," Gaudio said.

Current Broadway Frankie Valli, Jarrod Spector, was featured in San Francisco and Chicago before hitting the Great White Way. He knows the rigors of the role, and what it takes to keep his voice in shape.

"It takes a lot of work, really specific -- nothing that dries your voice, anything you can think of," Spector said. "No ibupfofen, no bloodthinners, no caffeine, no coffee, no chocolate, except for things that are herbal, no liquor."

Of course it doesn't hurt to have the real Frankie never far from the show. Seen at last year's Tony Awards alongside his Tony winning counterpart, John Lloyd Young, Frankie's never far from the footlights, whether touring with the Seasons or taking in the show, or giving notes.

"I'm not nervous of the press, I'm nervous because the man is going to be there in the audience holding court in the fifth row dead center and that was that is something that you can never quite duplicate, that experience of being there and hoping that you're doing justice to him and his music and telling a story," Spector said.