Parmi les succès de Campbell, on peut citer "Gentle on My Mind '' de John Hartford," 's' de Jimmy Webb 's' By the Time I Get to Phoenix '' and '' Wichita Lineman '', Allen Toussaint 's' Southern Nights 'et Larry Weiss' s 'Rhinestone Cowboy' '.
Parmi ses grands succès, citons 'Galveston', 'By The Time I Get to Phoenix' ',' 'Wichita Lineman', 'Try a Little Kindness', 'Gentle On My Mind' ',' Sunflower 'et' Hey Little One '.