The group last appeared on the "Billboard" Hot 100 singles chart in 1964, when "A Letter to The Beatles" charted for a total of three weeks beginning March 21, peaking at number 85 before being pulled from sale. Like most other folk revival groups, the arrival of The Beatles, along with the rest of the British Invasion, coincided with the decline of the Four Preps. In 1966, David Somerville, formerly of The Diamonds, joined the group, replacing Ingram. In 1969, the group disbanded, as their type of music had become less popular. Belland and Somerville occasionally performed as a duo after the breakup.