The Modern Folk Quartet

The Modern Folk Quartet (or "MFQ") were an American folk music revival group that formed in the early 1960s. Originally emphasizing acoustic instruments and group harmonies, they performed extensively and recorded two albums. In 1965, as the Modern Folk Quintet, they ventured into electric folk rock and recorded with producers Phil Spector and Jack Nitzsche. The group disbanded in 1966. https://en.wikipedia.org/wiki/Modern_Folk_Quartet