Tom Huizenga

Classical music has never lived in a bubble. For centuries, it's always found common ground with folk music.

Enter, the Danish String Quartet.

John Adams might be called the "documentarian" among American composers. His works have traced the birth of the atomic bomb, President Nixon's trip to China and the 9-11 attacks. Now, Adams turns to the California Gold Rush.

Like a good mixtape from a friend, performances by David Greilsammer tend to range widely in repertoire and surprise with cunning juxtapositions. On a recent album for example, the Israeli pianist alternated sonatas by avant-garde pioneer John Cage and baroque master Domenico Scarlatti.

Stile Antico is a 13-member a cappella choir based in London. These young, fresh-faced singers have already racked up some impressive awards for their recordings — mainly of intricately woven music from the Renaissance.

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