Joni Mitchell

Mitchell can be seen in a photo in this Rolling Stone article playing a Martin D 28.

The backstory of how she got that guitar is briefly explained in Unique Guitar blog : "The first professional instrument she owned was acquired back in 1966 when she received a 1956 Martin D-28 from a Marine captain. The captain was in Vietnam when his tent was hit with shrapnel, injuring him. The captain had two guitars inside his tent at the time. Joni claimed this Martin to be her best guitar ever. She wondered if the explosion did something to the modules in the wood, since the guitars sound was incredible. She used this guitar on all of her early albums. But by the time she recorded Court and Spark; the guitar had been damaged by an airline carrier and soon after was stolen from a luggage carousel."

This guitar was played on Joni's highlight ; including famous Isle of Wight festival, back in 1970.

In a picture on this site, Mitchell can be seen playing a red Parker Fly.

Mitchell can be seen in a photo on this site playing an Ibanez George Benson guitar.

According to Mitchell's official site, she uses a Roland VG-8. "In every gig since the 1995 New Orleans Jazz Festival, Mitchell has used the VG-8, using its effects to build a guitar sound reminiscent of her Hejira era."

The Appalachian dulcimer was used by Joni Mitchell to record "Blue" in 1971 and in many performance like this in London, https://www.youtube.com/watch?v=IAsXMlkwXgs