Coyote Rick writes:

The "Joni-like" character was played by Kirsten Dunst. She was a high school singer/songwriter. She was in a group of friends when one asked if anyone heard her music before. The friend said something like "She could be the next Josie Mitchell." To which Kirsten's character replies, "That's Joni Mitchell."

(Contributed by Mrs. Cameron, Coyote Rick)