“Even as opera remains the butt of jokes, opera-styled pop — big, booming voices delivering mellifluous melodies over lush, orchestral arrangements — keeps popping up at the top of the charts. The field isn’t especially large, but it encompasses a fairly wide array of stars, from the male quartet Il Divo to teen soprano Charlotte Church, and from former Andrew Lloyd Webber star (and spouse) Sarah Brightman to occasional Luciano Pavarotti duet partner Andrea Bocelli.”