Wikipedia : This day (November 7, 1943), in Fort Macleod, Alberta, Canada, is born Roberta Joan Anderson a.k.a Joni Mitchell, a Canadian musician, singer songwriter and painter..
Official Site : A singer, composer and lyricist of exceptional talent and unmatched influence, Joni Mitchell has crafted an extraordinary body of work spanning more than 40 years and is widely regarded as one of the brightest musical lights of recent generations.
@allmusic : Uncompromising and iconoclastic, Mitchell confounded expectations at every turn; restlessly innovative, her music evolved from deeply personal folk stylings into pop, jazz, avant-garde, and even world music, presaging the multicultural experimentation of the 1980s and 1990s by over a decade.
@last.fm : In 1975 Joni released “The Hissing of Summer Lawns” which can be seen as an artistic turning point, and the beginning of her unique blend of folk, jazz and rock. It was intended as a concept album of sorts, with the “concept” being the contrast being freedom and slavery, and the idea that wealth and status sometimes ironically place a great many constraints on people’s behavior.
@Discogs : Mitchell’s distinctive harmonic guitar style, and piano arrangements all grew more complex through the 1970s as she was deeply influenced by jazz, melding it with pop, folk and rock on experimental albums like 1976’s Hejira.