Philip Glass - Composer

Philip Glass is one of the most influential and polarising composers of the last 50 years. His trademark sound is repetitive, rhythmic and hypnotic - some call it musical minimalism. It's a style which has infused his prolific output of symphonies, operas, film scores and even soundtracks for TV commercials. He's been driven, he says, by a simple question, what is music? So what's his answer?