Dale Sisters Trio
Singing group with swing band Hal Harrison and His Harmony Men, from the 1938 mystery novel Sudden Silence, the Case of the Murdered Band-Leader, by Cortland Fitzsimmons (New York, Frederick A. Stokes Company).
It was Mary Dale who spoke. She was a blonde, slim and trim as a racing craft. Her soft husky voice and warm friendly eyes had made her the leader of the famous Dale Sisters Trio which had been associated with Hal from his early days. As Hal's popularity increased, the Dale Sisters became proportionately famous.