Mahler experienced the best years of his life from 1902 to 1907. He and Alma had started a family and built a summerhouse where Mahler could compose. In 1902, Mahler completed his Symphony no. 5, a superb example of the Expressionist art movement. Mahler befriended Arnold Schönberg, one of the most well-known Expressionist composers of the early 20th century.