It took me a while to actually like Joni Mitchell’s music. I always thought of her as some hippie chick who sang in a nun’s soprano. At least until her album Court And Spark came out in 1974 and all the music magazines I read at the time published articles about her. A couple of them mentioned that she had come up with a system of alternate tunings on the guitar and that she would switch tunings for different songs. That piqued my interest in her, because all I really knew was the standard EADGBE and open E (EBEG#BE) that I had just recently learned for playing slide guitar. I was always afraid to do too much alternate tuning, because (a) I broke enough strings as it was and (b) the trick for me was always getting back into standard tuning. (They hadn’t invented the electronic tuner yet. Believe me, it would have made all the difference.) Anyway, I started to listen more closely when her songs would come on to see if I could figure out how she had her guitar tuned. I never quite figured it out, but I did learn to like her music. This is from Court and Spark.