These early commercial recordings in America and in Greece had however been preceded by a group of documentary recordings, consisting of one shellac 78 rpm disc and five wax cylinders, made in Görlitz, Germany in July 1917, during WWI. The amateur bouzouki player Konstandinos Kalamaras accompanied a professional Byzantine singer, Konstandinos Vorgias, and an amateur singer, Apostolos Papadiamantis. These three men were among 6500 Greek soldiers interned as guests of Germany in an ex-POW camp in the small town of Görlitz at the Polish border, from September 1916 until their release in February 1919.