Francis Lai
Keller also wrote the English lyrics of "A Man and a Woman", from "Un homme et une femme" by Francis Lai and Pierre Barouh. "A Man and a Woman" was recorded by such artists as Matt Monro, Ella Fitzgerald, Engelbert Humperdinck, Johnny Mathis and José Feliciano. In addition, he co-penned "Almost There", a successful single for Andy Williams, plus "How Does It Go?" recorded in 1965 by Ricky Nelson, and "Turn-Down Day," a hit for The Cyrkle in 1966.