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Suddenly It's The Hi-Lo's was released originally in 1957, and features a number of jazz and pop standards, as well as a version of "Brahms' Lullaby", arranged by Puerling. Much of the material is a capella but they are backed up by an orchestra led by Frank Comstock, a well-known composer and band leader who worked extensively in TV and film.
For more information on the Hi-Lo's, visit their still-functioning website here. If you have your speakers on, you will be greeted by the group singing "Welcome to the Hi-Lo's ... dot com. BOP!"