[1] As well, Miller shared a Tony Award with the other members of the ensemble cast of Baz Luhrmann's 2002 revival of La bohème in 2003.

In 1999, he appeared with the Los Angeles Opera in the role of Tybalt in Thor Steingraber's production of I Capuleti e i Montecchi by Vincenzo Bellini.

In 2000, he made his debut with Opera Australia and at Teatro alla Scala in Milan, singing Tony in West Side Story.

In 2003, he sang with the Los Angeles Philharmonic and Audra McDonald at the Hollywood Bowl in excerpts from West Side Story.

In December 2007, while Il Divo was taking a break from their world tour, David made a return to the classical opera stage.

He performed in recital with the Chicago Pops Orchestra, singing a variety of tenor arias as well as some show tunes and Christmas favorites.

In December 2003, he became a member of the international musical quartet Il Divo along with Swiss operatic tenor Urs Bühler, French pop singer Sébastien Izambard, and Spanish baritone Carlos Marín.