Conversation so far:
what political protest did frenzal rhomb and jackie o participate in?
protest against incumbent Prime Minister John Howard's government.
why did they protest?
compilation album, by various Australian musicians as a protest against incumbent Prime Minister John Howard's government.
what is the name of the album?
CANNOTANSWER.
what occurred in 2004?
July 2004, radio station 2Day FM presenter Jackie O was to MC at the Bassinthegrass festival in Darwin.
what songs did they play?
"Thunderstruck.
was the festival successful?
CANNOTANSWER.

Question: who is Jackie O?
Self-contained rewrite: who is Jackie O?