The Hollies are a British pop/rock group best known for their pioneering and distinctive three-part vocal harmony style. The Hollies became one of the leading British groups of the 1960s (231 weeks on the UK singles charts during the 1960s, the 9th highest of any artist of the decade) and into the mid 1970s. It was formed by Allan Clarke and Graham Nash in 1962 as a Merseybeat-type music group in Manchester, although some of the band members came from towns north of there. Graham Nash left the group in 1968 to form the supergroup Crosby, Stills & Nash.