Here is a book to look for in your library:
Yes, We Sang! Songs of the Ghettos and Concentration Camps By Shoshana Kalisch

Also, Rosalie Gerut has a 1988 CD called ‘We Are Here’ with many fine tracks. All of the musicians on the recording are descendants of a Holocaust survivors. Track 10 is Rosalie’s original composition ‘Children’s Song’ and is a lovely lullaby and wish for all children.