Joni Mitchell: Jones Beach Theater, New York

DURING THE COURSE of her unpredictable but resilient career, Joni Mitchell has been the dewy-eyed sophomore, the slit-eyed hipster, the clear-eyed visionary. Her songs of innocence and experience have taken her from strum-along 1960s coffee houses to collaborations with the late Charles Mingus, one of this century's most indomitable jazz composers and bandleaders.