Philip Gary "Flip" Sloan, known professionally as P. F. Sloan, was an American singer and songwriter. During the mid-1960s, he wrote, performed, and produced many Billboard Top 20 hits for artists such as Barry McGuire, the Searchers, Jan and Dean, Herman's Hermits, Johnny Rivers, the Grass Roots, the Turtles, and the Mamas and the Papas.

Barry McGuire is an American singer-songwriter primarily known for his 1965 hit "Eve of Destruction". He later pioneered as a singer and songwriter of contemporary Christian music.