The Hi-Lo's were a vocal quartet formed in 1953, who achieved their greatest fame in the late 1950s and 1960s. The group's name is a reference to their extreme vocal and physical ranges.

Eugene Thomas Puerling was an American vocal performer and arranger. Puerling created and led two prominent vocal quartets, The Hi-Lo's and The Singers Unlimited. He was nominated for 14 Grammys and awarded the Grammy Award for Best Vocal Arrangement for Two or More Voices in 1982.