They last played our series in 2002, and are still singing Bach and the Beatles, Schubert and Billy Joel. The five former members of St. Thomas’s Boys Choir in Leipzig who make up AMARCORD have delighted concertgoers with their immaculate, a capella elegance. Their concerts have been described as “vocal magic,” “astonishing” and “world class.” Said one reviewer, famously, “They sing like angels and look like the Backstreet Boys. Well, maybe a little more clean cut.”