The Hi-Lo's were a vocal quartet formed in 1953, who achieved their greatest fame in the late 1950s and 1960s.

[2] In 1966, Gene Puerling and Don Shelton along with Bonnie Herman and Len Dressler, formed another vocal group, The Singers Unlimited.

[1] The group provided a wide range for Puerling's arrangements, the four singers multi-tracked as many as 16 voices.

Afterward, Puerling, Shelton, and Clark Burroughs still appeared as the Hi-Los's however only occasionally in various cities in southern California.

The Hi-Lo's and especially their innovative use of vocal harmony, were an influence on the groups and musicians Take 6,[3] The King's Singers, The Manhattan Transfer, Chanticleer, The Free Design, Herbie Hancock,[4] The Association, First Call, and Brian Wilson.