Joni Mitchell is one of the most influential songwriters of all time, and she has been producing music for over fifty years now. With such a long career, it can be difficult to pick just one as her best work. Below, we'll take a look at some popular opinions on this subject and discuss whether or not they hold up. One of the most popular opinions is that Mitchell's best song is "A Case Of You ," from her 1971 album Blue. The lyrics describe a breakup, which many people have used as a soundtrack to their own breakups, including musician Ben Folds , who described the song as "a great outpouring of emotion." Many musicians have covered the song, including Elvis Costello and Tori Amos , but most notable was a cover by Johnny Depp in 2005.