Conversation so far:
How old were the boys when then started doing music together?
CANNOTANSWER.
The group changed their name many times, what was another name they used?
CANNOTANSWER.
What was the name of the groups breakthrough album?
its major label debut, Dookie.

Question: What is your favorite fact about Green Day?
Self-contained rewrite: What is your favorite fact about Green Day?