The sisters are portrayed by Lindsay James, Kyra Weinberger and Samantha Agron. Members of the band are Ken Remmert (drums and one turn as Der Bingle), Harold Steinhardt (reeds), Brian Padavic (bass) and Lenora Remmert (piano).
As I listened to "I'll be with you in apple blossom time" and other melodies expressing the longing for home and domestic life, I wondered what was playing on the German, Italian and Japanese home fronts. Here is a Wikipedia entry on the topic.