‘Spider-Man: Turn Off The Dark,’ the first Broadway show for U2’s Bono and the Edge, is opening for previews this Sunday to a sold-out audience.

Getting the megamusical to the stage was a challenge.

"Easier than we could ever have imagined. Harder than we ever thought," Bono told the Evening Herald.

"I mean, easier in the sense that the music came to us effortlessly. Dreaming up the show, the scale of it, the flying sequence, the pop art opera that it is -- that was all pure joy," he adds.

"What we didn't realize was how difficult it is to stage this stuff, both technically and financially."

"Is there jeopardy? Yes. Because it's technically very difficult. It has never been achieved before -- the kind of scale of what we're looking for. There may be very good reasons. We're going to find out. The expense of it? A lot of it was the delays."

The two signed on to write the score in 2002 with co-writer and director Julie Taymor, the Tony Award-winning creator of The Lion King.

The show boasts huge sets, aerial stunts, an 18-member orchestra and a cast of 41. The musical has a total of 40 pieces of music, including 18 songs. Only four or five of the pieces are rock songs.

"It's much more varied than anything we would ever achieve or set out to do with U2," said The Edge.

"There's big, otherworldly melodies. There's dance numbers. There's experimental, avant-garde, jagged metal pieces,” adds Bono.

He said only two songs were started before work on the project began and the rest were created for the show.

"As much as we've used our experiences with U2 to inform the way that we approach writing for this, we think that the opposite will happen, and when we come back to U2 Land, it'll be with a certain knowledge and sense of new thoughts and new ideas," said The Edge.

Both men are happy with the final product.

"I think even though it looks like there's a lot of ill will against us, I think it'll turn around," said Bono.

"If it's just spectacle, we will have failed. But if you can be moved, and if you believe these characters, and if Spider-Man outlives his fabulism and you really buy into the myth, it's a great American story."