This episode, entitled Sweet
Sour Charity, originally aired in the US on April 4, 2000. Will and Grace win front row tickets to a Joni concert from a contest on a radio call-in show. Grace sings a little bit of Free Man in Paris and even says that Joni is her favorite performer. Although Joni never appears on screen, we eventually learn that Grace gets booted from the concert by Joni for singing too loudly.
[Episode transcript available here.]
Sweet & Sour Charity
Original Air Date: April 4, 2000
(Contributed by Bob Murphy)