While the romance between Graham Nash and Joni Mitchell lasted only two years, from 1968 to 1970, the musicians produced some of their greatest music inspired directly by their relationship. Mitchell continued to help form CSNY after Nash met Crosby and Stephen Stills. David Crosby recalled that the first time, he, Nash, and Stephen Stills performed together, it was at a house in California owned by either Mitchell or fellow singer Mama Cass (via Vh1 Legends on YouTube). Nash quickly returned to England to quit the Hollies and to form CSN (Neil Young would not join the group until the second album).
During this time, he continued to see Joni Mitchell, who was emerging as a respected musician in her own right. Mitchell had grown so popular that by 1969, she had planned to attend and perform at Woodstock. However, because of scheduling conflicts, she was forced to decline while Nash performed as a part of the now completed, CSNY (via Polyphonic on YouTube). Upon returning to Mitchell shortly after the festival, Nash told her of the experience and the atmosphere, which Mitchell turned into the song, "Woodstock." CSNY would cover the song on their "Deja Vu" album. On the album was also the Nash penned track, "Our House" which he said told of an actual scene of Mitchell and he spending time in their home together (per Far Out Magazine).
