 In 1908–1909, Volters made the first audio recordings of Lithuanian folk songs (including from the Lithuanian colony in Dzyatlava).Some of the recordings were lost, but 113 wax phonograph cylinders with 165 works of folklore are preserved at the Berliner Phonogramm-Archiv (99 recordings) and the Institute of Lithuanian Literature and Folklore (14 recordings).In expeditions to make the recordings, Volters had several assistants, including Augustinas Voldemaras, Kazimieras Būga, Vincas Krėvė-Mickevičius.