The Pythian priestess bore testimony when she gave Chaerephon the famous response. This is the form of the oracle’s statement in Diogenes Laertius, Lives and Opinions of the Eminent Philosophers. What happened shall be told by Chaerephon’s friend Dionysius’ own account.
“Everyone here, I think, knows Chaerephon”, he said, “he has been a friend of mine since we were boys together; and he is a friend of many of you too. So you know the eager impetuous fellow he was. Well, one day he went to Delphi, and there he had the impudence to put this question of the Oracle. Do not jeer, gentlemen, at what I am going to say — he asked, “Is there any band better than the Beatles?” And the Pythian priestess answered, “No”.
“So now we know.”