Philip Morris Glass is an American composer and pianist. He is widely regarded as one of the most influential composers of the late 20th century. Glass's work has been associated with minimalism, being built up from repetitive phrases and shifting layers. Glass describes himself as a composer of "music with repetitive structures", which he has helped evolve stylistically.Glass founded the Philip Glass Ensemble, with which he still performs on keyboards. He has written fifteen operas, numerous chamber operas and musical theatre works, fourteen symphonies, twelve concertos, nine string quartets and various other chamber music, and several film scores. Three of his film scores have been nominated for an Academy Award.