Schoenberg taught him harmony, counterpoint and music theory, all the things one needs to know to compose well. Berg had lessons from him from 1904 until 1911. His first proper pieces include a Piano Sonata and a String quartet. Here he had already found the modern style which suited him. He wrote harmonies which seemed to float. He often wrote pieces with several movements which are all linked by a common theme. He also liked themes which are heard upside down, or palindromes, where the tune sounds the same forwards as backwards. He met a girl called Helene and they married in 1910.