Leyla McCalla, a singing, songwriting cellist and former member of the Carolina Chocolate Drops, once aspired to being a classical musician laboring in the rarified world of chamber music. She earned a degree in cello performance from New York University in 2007. When she moved to New Orleans in 2010, J.S. Bach and his cello suites were her music foundation. Taking up the busking life, she performed Bach and the music of his Italian Baroque contemporary, Antonio Vivaldi, at Royal and Conti St...