songs by himself under the 'team banner' (like Lennon & McCartney), for example, 'Fifi the Flea' (1966), 'Clown' (1966), 'Stop Right There', 'Everything is Sunshine' (1967). The Butterfly album included several of his songs that had less group participation and exhibited more of a singer-songwriter approach. He was disappointed when this new style did not register with their audience, especially "King Midas in Reverse" (Nash and producer Ron Richards clashed over this song because Richards believed it was 'too complex' to work as a hit single). Nash initially met both David Crosby and Stephen Stills in 1966 during a Hollies US tour. On a subsequent visit to the US in 1968, he was more formally introduced to Crosby by mutual friend Cass Elliott in Laurel Canyon, Los Angeles. Nash left the Hollies to form a new group with Crosby and Stills. A trio at first, Crosby, Stills & Nash later became a quartet in 1969 with Neil Young: Crosby, Stills, Nash & Young (CSNY). With both configurations, Nash went on to even greater worldwide success, penning many of CSN's most-commercial hit singles such as "Our House" (about the house in Laurel Canyon shared with his then-lover Joni Mitchell); "Teach Your Children" and "Marrakesh Express" (both of which had been rejected by the Hollies); "Just a Song Before I Go"; and "Wasted on the Way". Nash, nicknamed "Willy" by his bandmates, has been described as the glue that keeps their often fragile alliances together. Nash became politically active after moving to California, as reflected in his anti-Vietnam War songs "Military Madness" and "Chicago / We Can Change the World" (about the trial of the Chicago Eight). In 1972, during CSNY's first hiatus, Nash teamed with Crosby, forming a successful duo. They have worked in this configuration on and off ever since, producing four studio albums and a few live and compilation albums. His song "Immigration Man", Crosby & Nash's biggest hit as a duo, arose from a tiff he had with a US Customs official while trying to enter the country. In 1979, Nash co-founded Musicians United for Safe Energy which is against the expansion of nuclear power. MUSE put on the educational fundraising No Nukes events. In 2007 the group recorded a music video of a new version of the Buffalo Springfield song "For What It's Worth". Nash briefly rejoined the Hollies in 1983 (to mark their 20th anniversary) to