When Missy Mazzoli was just 10 years old, growing up in rural Pennsylvania, she confidently declared she was a composer, although she hadn't written a single note. Her family thought it was a phase she would get through.

Now 42, Mazzoli is among today's busiest and most respected composers. She's best known for her operas, such as the career-boosting Breaking the Waves, but a new album, titled Dark with Excessive Bright, is the first to showcase the young composer's purely symphonic music.