The rollers arrived in Berlin in 1919 and were not galvanised until the early 1930s. Correspondence is available. Extensive reports on his research trips to Colombia by Preuss have been published, as well as numerous texts and translations (Preuss 1921 and [?]. Fritz Bose wrote his doctoral thesis on the material (Bose 1934), further transcriptions in Bose 1953b and 1958. Further documents in the EM and in the Ibero-American Institute in Berlin. contents: traditional songs (music for festivals), partly with instrumental accompaniment.