We began our research at the International Institute of Social History in Amsterdam , where rare phonographic material resides. After patiently listening to 33 rpm vinyl records and audio cassettes, we officially requested the selected material, which was delivered to us two months later.

We went to the Jazzarchief in Amsterdam to find pre-war recordings of Dutch Jewish jazz musicians who died in the camps; the staff was very helpful and gave us a 33 rpm vinyl record of Songs by the Dutch duo Johnny & Jones (who died in Bergen-Belsen).

In Amsterdam, antiquarian book collections were thoroughly searched, which enabled the recovery of books on concentration camp music in the Gulag; at the NIOD Institute for Oorlogs-, Holocaust- and Genocide Studies, we removed numerous discarded books from their library.

The research continued in Almere with Mirjam Krieg, daughter of Hans Krieg, who was deported to Westerbork and Bergen-Belsen. Krieg gave us works by her father but told us to go to the Nederlands Muziek Instituut in The Hague and the Joods Historisch Museum in Amsterdam for other works. Having to choose due to lack of time, we opted for the Joods Historisch Museum.

From Almere we traveled by train…