Michael Tilson Thomas conducts the San Francisco Symphony. Bill Swerbenski/San Francisco Symphony hide caption

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Composer Meredith Monk being interviewed during the 'American Mavericks' event at The Greene Space, New York City, on March 26, 2012. Matthew Septimus/courtesy of New York Public Radio hide caption

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Composer Henry Brant took 36 years to transform the "Concord" sonata by Charles Ives into a full-fledged symphony. SFS Media hide caption

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Projections on the giant sails of the Sydney Opera House, which served as the venue for the YouTube Symphony Orchestra concert. Chris Phillips/YouTube hide caption

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