Add to ORKGThis work is aimed to acquaint the reader with the work of American composer John Cage in 20th century primarily with his work related to dance, movement and theatre. First of all, it describes the composer's musical development, systems and principles of his work that he reached on the basis of his music practise. After explaining how the Cage applied these principles in other artistic disciplines attention is focused to dance, movement and theater. In conclusion, the work focuses on the reference of John Cage's art and theater legacy ? This, his own life philosophy, which had been develo- ped for many years of his work and in which Cage came to simple persuasion - the most important thing is the existence of music and noises as themselv...