Since her debut album in 1968, Canadian musician Joni Mitchell has released 19 studio albums, most recently 2007's Shine. Her most successful period was the early-mid 1970s, which included 1971's Blue and 1974's Court and Spark, which both reached Platinum status in the US. In the United States alone, Mitchell has accrued record sales in excess of 10 million copies, 7 million of which have been certified by the RIAA. In the UK, she has certified album sales in excess of 1.3 million copies.