 In March 1970, "Clouds" produced her first Grammy Award for Best Folk Performance.The following month, Reprise released her third album, "Ladies of the Canyon".Mitchell's sound was already beginning to expand beyond the confines of acoustic folk music and toward pop and rock, with more overdubs, percussion, and backing vocals, and for the first time, many songs composed on piano, which became a hallmark of Mitchell's style in her most popular era.