I saw Joni Mitchell only once -- not in her sheepish minstrel days but rather in concert with Tom Scott and his big band, the L.A. Express at Miami's Jai Alai Fronton. The musicians were touring in support of Mitchell's landmark album Court and Spark, and their union would later be celebrated on the live double album Miles of Aisles. While many claim that Mitchell's music was best served by a simple setup of only vocals and acoustic guitar, I can attest to the fact that with a jazz band in tow, she never sounded better.
The above is from Lee Zimmerman's "Richie Havens' Chompers and Five More Folk Legends" (Broward Palm Beach Music). I have no idea how many times I have seen Joni in concert. I believe the first time I caught her live was for Ladies of the Canyon. I also believe I've seen all of her tours since. Tours proper. I also saw her at the Amnesty festival at the end of the 80s and on the Bob Dylan roadshow of the seventies and I'm sure there may be more.