In the 1960s, with Nash performing few guitar duties except for the occasional rhythm part and acoustic work, Hicks became an integral part of the Hollies sound. Apart from contributing distinctive lead-guitar parts, he could be relied on to add unusual instrumentation to their sessions—such as the banjo which was a key component of their hit "Stop! Stop! Stop!", Greek-type ("Tell Me to My Face") and fuzz guitar ("Have You Ever Loved Somebody"). When no original material was available, Hicks discovered demos of Hollies hits "Just One Look" (UK No. 2 in 1964), "I Can't Let Go" (UK No. 2 in 1966) and "He Ain't Heavy, He's My Brother" (UK No. 3 in 1969) (which became one of their biggest hits).