Rivers charted during the 1960s and 1970s but remains best known for a string of hit singles between 1964 and 1968, among them "Memphis" (a Chuck Berry cover), "Mountain of Love" (a Harold Dorman cover), "The Seventh Son" (a Willie Mabon cover), "Secret Agent Man", "Poor Side of Town" (a US #1), "Baby I Need Your Lovin'" (a 1967 cover of (the) Four Tops single from 1964), and "Summer Rain".