One thing to consider is that most people in nursing homes these days have no firsthand recollections of songs of the 20s. They may know and enjoy them, as any of us might enjoy songs written before we wer born.But they were most likely born in the twenties. The songs of their youth would be songs of the forties and even fifties. So don't think they enjoy songs from the 20s more than later songs. I recently played at home for "Senior Living" and got the best response for "Fever" which was recorded by Peggy Lee in the 50s.