This is a full concert video from a performance in 1979 that has some video added (sort of montages from different performances for certain songs).
Joni Mitchell is performing with Michael Brecker on saxophone, Jaco Pastorius on bass, a really young Pat Metheny on lead guitar, Lyle Mays on keyboard, and Don Elias on the drums and congos. She also has the Persuasions singing vocals during parts of the concert.
It is an amazing lineup, and worth the watch.