The Murtah Sisters (Kate, Jean, and Onriett Murtagh) spent most of their singing career in the 1930s and '40s performing live, so there are very few film clips of them. This one was recorded in 1942. Kate Murtagh (the tall one) went on to movies and TV, where she found work until she retired in 1999. She is enshrined on the front and back covers of Supertramp's 1979 album Breakfast in America. If you want to see more of the Murtah Sisters, here they are performing "Arthur Murray Taught Us Dancing in a Hurry," also from 1942.