"Sweet Sir Galahad" is a song written by Joan Baez that she famously performed at the Woodstock Festival in August 1969,[1] after having debuted it during an appearance in a Season Three episode of The Smothers Brothers Comedy Hour, which aired on March 30, 1969.
The song tells the story of Baez's younger sister Mimi Fariña and her marriage (her second) to music producer Milan Melvin.
Baez was inspired to write the song after hearing of Melvin's courtship of Fariña, during which he came into her bedroom at night through a window.
In her 1987 memoir And a Voice to Sing With, Baez described "Sweet Sir Galahad" as the first song she ever wrote (although she is credited as a co-writer on two tracks on her 1967 album Joan).
A live version of the song appears as a bonus track on the 2006 reissue of Baez's 1995 album Ring Them Bells.