Legacy of Four Tops

The Undisputed Truth was an American Motown recording act assembled by record producer Norman Whitfield to experiment with his psychedelic soul production techniques. Joe "Pep" Harris served as main lead singer, with Billie Rae Calvin and Brenda Joyce Evans on additional leads and background vocals.

Arnold George Dorsey, known professionally as Engelbert Humperdinck, is a British singer. He achieved international success in 1967 with his recording of "Release Me".

Donnie Elbert was an American soul singer and songwriter, who had a prolific career from the mid-1950s to the late 1970s. His U.S. hits included "Where Did Our Love Go?" (1971), and his reputation as a Northern soul artist in the UK was secured by "A Little Piece of Leather", a performance highlighting his powerful falsetto voice.

Johnny Rivers is an American retired musician. He achieved commercial success and popularity throughout the 1960s and 1970s as a singer and guitarist, characterized as a versatile and influential artist. Rivers is best known for his 1960s output, having popularized the mid-1960s discotheque scene through his live rock and roll recordings at the Los Angeles nightclub Whisky a Go Go, and later shifting to a more orchestral, soul-oriented sound during the latter half of the decade. These developments were reflected by his most notable string of hit singles between 1964 and 1968, many of them covers. They include "Memphis", "Mountain of Love", "The Seventh Son", "Secret Agent Man", "Poor Side of Town", "Baby I Need Your Lovin'", and "Summer Rain". Rivers had a total of nine top-ten hits and 17 top-forty hits on the US charts from 1964 to 1977.