Twenty years ago, Boston University student Craig Costanza began writing a musical about the biblical figure King David. But life – including a year ot study at Berklce College of Music, time spent playing in a Top 40 cover band and his career as a dentist with a prac­tice in Revere – interfered. But this weekend. Costanza, music and lyrical collaborator Richard Mut­koski and composer Tim Murner will see a full production of “The Faith of David” mounted at the Emerson Majestic Theatre.

“lt’s been amazing to see a cast take the characters you’ve been sitting in your room with, and turn them into real people,” says Costanza, who wrote the book and lyrics. But I always knew the story would translate well to a musical format. David was such a multidimen­sional character – a musician, poet, writer, warrior, king – it was easy to imagine him singing on a stage.”
 
Costanza says the scope of David’s tale – from his defeat of the giant Go­liath to his ascent to the throne, his adul­terous relationship, the murder of his lover’s husband, and the murder of one of David’s sons by his brother – makes the story accessible and compelling.

“The parallels between 3,000 years ago and today are impressive,” he says. “The things that were going on then you could practically rip out of a headline today.”
 
     Costanza says the long gestation process has been fine with him. “My job is as a dentist,” he says, ‘but, of course. there have been moments when the perfect line came to me in the middle of drilling a tooth.”

     Although Costanza calls this production of “David” a work in progress, his creative team has created a full set of costumes for a cast of 75 actors.

     He, Murner and Mutkowski are widerwtiting the production. with help from family and friends. But Costanza says interest in the show has already spread to New York.
 
     “We’re in the process of negotiating with four lawyers, a theatrical agent and several New York investors,” says Costanza. “We’re hoping to see the show on Broadway this fall.”