Tom Huizenga

Arvo Pärt is one of the few living composers to find popularity beyond the borders of classical music. R.E.M.'s Michael Stipe and Bjork are big fans.

In 1986, four women gathered in a casual setting to sing through a bit of medieval chant. Little did they know they were launching Anonymous 4, an a cappella ensemble that has spanned nearly 30 years, 20 albums, countless concerts and more than a millenium of music.

Today the group announced that the 2015-16 season will be its last together. But this isn't the first time Anonymous 4 has thought about calling it quits. The group bid a similar farewell in 2004.

John Luther Adams, whose music is inspired by — and sometimes performed in — natural landscapes, has won the Pulitzer Prize for music for his symphonic work Become Ocean.

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