NEW YORK — Even Diane Warren doesn't have the pronunciation of her new group's name down just yet.

"I'm not even sure I say it right," says the Grammy-winning songwriter about the duo Due Voci, whose self-titled CD makes its debut this week.

"DOO'-ay voh-CEE', I think," she says, getting it right on her second try.

But the woman behind smash hits like Celine Dion's "Because You Loved Me" and Toni Braxton's "Unbreak My Heart" is sure about the potential of Due Voci, a classical crossover act in the vein of Il Divo.

"This is the first record I've developed someone ... I'm really proud of it," said Warren, who has also been nominated for Academy Awards for her songwriting. "I believe in these guys."

Due Voci unites the voices of Kelly Levesque, a member of the classical crossover duo Three Graces, and Tyler Hamilton, who was a finalist on "Canadian Idol." The album features them singing some of Warren's biggest songs, like "How Do I Live," a hit for LeAnn Rimes and Trisha Yearwood, and Aerosmith's "I Don't Want to Miss a Thing."

Although those singers helped make those songs classics, Warren says Due Voci gives them new life: "I just think these songs have never been sung that romantic."

Due Voci are part of a booming genre in music — pop songs performed by big voices with a classic lilt — such as Il Divo, Josh Groban and even Susan Boyle, all top-sellers. Warren says these acts have success because they appeal to a more mature audience that appreciates music in a different way.

"There's a whole adult market and they buy records, they don't just by singles. They want to hear real songs, they want to hear beautiful melodies performed by great singers, and that never ends," she said. "They're not going to download it for free and just want one song, they're going to want the whole experience."

Due Voci is one of the acts featured on the television special "Diane Warren Love Songs," which is airing on PBS this month (check local listings for dates and times). Other performers include Braxton and Rimes.