Listen to the BBC Radio 3 feature on music created by concentration camp prisoners while they were in prison.
“From string quartets in Theresienstadt and tender ghetto lullabies to the fighting songs of the Jewish partisans, macabre camp ballads, and sardonic cabaret. Nazism's victims used music to document their lives, to mourn the loss of home and family, to show solidarity with the anti-fascist cause, to escape reality, to indulge in gallows humour. They also made music on the orders of their jailers, who used music both to celebrate and to oppress.”