Roberta Joan Anderson (born November 7, 1943 in Fort Macleod, Alberta, Canada), better known as Joni Mitchell, is a Canadian songwriter, musician and artist. Her usual musical instrument is a guitar. Her songs include "Big Yellow Taxi", "Woodstock" (about the 1969 Woodstock Festival), "Free Man In Paris", "Help Me" and "Both Sides Now". Her name Mitchell comes from her first marriage (to Chuck Mitchell).