Conversation so far:
Did Janis Joplin preform at WoodStock?
Janis Joplin appeared at Woodstock starting at approximately 2:00 a.m., on Sunday, August 17, 1969.
Was Janis Joplin performance at woodstock a success?
Janis Joplin wasn't at her best, due to the long delay, and to the amount of booze and heroin she'd consumed. But even Janis on an off-night was incredible.
Why did Janis Joplin blame peggy Caserta for her performance at woodstock?
Janis Joplin was unhappy with her performance.
What was Janis Joplin's relationship with peggy Caserta?
Janis Joplin had an on-again-off-again romantic relationship with Peggy Caserta.
How did Janis Joplin feel about performing at WoodStock?
Janis Joplin was extremely nervous and giddy.
Did Janis Joplin have any personal supporters with her when she went to Woodstock?
Janis Joplin and the band were flown by helicopter with Joan Baez.
Did Janis Joplin perform with any other famous people at woodstock?
Janis Joplin was among many Woodstock performers who stood in a circle behind Crosby, Stills & Nash during their performance.
Are there any other interesting aspects about the Janis Joplin article?
Janis Joplin's singing was not included in the 1970 documentary film or the soundtrack for Woodstock: Music from the Original Soundtrack and More.

Question: Was her singing not included because she was not happy with her performance at woodstock?
Self-contained rewrite: Was Janis Joplin singing not included in the 1970 documentary film or the soundtrack for Woodstock: Music from the Original Soundtrack and More because she was not happy with her performance at woodstock?