premise: Joni Mitchell released her final album in 2007.
hypothesis: Both Sides Now is a concept album by Canadian singer-songwriter Joni Mitchell released in 2000 . Dog Eat Dog is the 12th album by Canadian singer-songwriter Joni Mitchell , released in 1985 . Joni Mitchell . A blunt critic of the music industry , she quit touring and released her 17th , and reportedly last , album of original songs in 2007 .