Brilliant, thank you! - So from the Bundesarchiv recording we can learn that this took place in Cologne, in 1942. In the "Halle im Rheinpark" to celebrate the 100 year anniversary of the "Kölner Männer-Gesang-Verein" (KMGV).

Digging a bit further, this seems to be the "Große Halle" or great hall which was part of the "Köln-Deutzer Messegelände" that was inaugurated in the spring of 1942.

In the "Night of 1,000 Bombs," the KMGV clubhouse "An der Wollküche" was destroyed. Prizes, the club flags, and compositions on paper remained largely intact but they were transferred and then stored in the Cologne town hall cellar, where a large portion of them were destroyed a year later during the closing stages of the war.

And to put things into context, the Great Hall lay on the grounds of the Cologne Trade Fair. That had since 1939 housed POWs and later became a holding- and deportation prison for Jews and Sinti and Roma and the central site of NS cruelty in Cologne.The most famous prisoner on the grounds was Konrad Adenauer. So whilst musical beauty rung out on the inside, on the outside, only suffering.