The musical Once, based on a low-budget 2006 independent film of the same name, earned eight Tony Awards in 2012, including the Broadway season’s best new musical. That’s pretty amazing for the story of a Dublin street musician ready to give up his dream when a young woman takes sudden interest in his songs. One of those, “Falling Slowly,” won the Academy Award for best original song in 2007. The story is set in an Irish pub, and the cast of 13 actors provide all of the show’s musical accompaniment. It’s a simple story about music and love, told in a most imaginative way.