This is a 'clip' from an article that I found, hope it helps...
The song was powered by riffs combining Rolling Stones-style chord changes with the Who�s trademark power slams, but the song�s real innovation was Townshend�s pioneering use of synthesizers.
Townshend had been at work on a science-fiction rock-concept work, Lifehouse, which, he says, �explored the Sufic notion that all life and all nature is based on harmony or disharmony of a very physical variety.� He collected information from test individuals�heartbeat, brain rhythms, astrological data�tabulated the information on charts and converted the numbers into synth patterns. The resulting patterns became the opening of �Won�t Get Fooled Again.� Glyn Johns, who produced the final version of the song, says, �Pete came up with synthesizer basics for the tracks, which were just unbelievable. Nobody had done it that way before.�