1 Schoenberg used atonality in the music of his middle period.

2 Arnold Schoenberg's early works of atonality, because of the structural functioning of missing of "tonality", can only keep unity by dint of "strengthened theme coherence".

3 His early compositional style is often Romantic in character, while the middle period works lead to the atonality typical of his late music.

4 He was also one of the few composers to bridge the gap between conventional tonality and atonality.

5 This paper focus on the two systemized and influential atonality theories, the symmetry theory and the picth class set theory.

6 His basic musical idioms were based on the tradition of tonality, but he also, if necessary, resorted to dissonances and occasional atonality.

7 Perhaps the first truly 20th century composer, he prefigured the developments in atonality that would soon occur in Vienna.

8 What he pursued the originality constantly, in melody, harmonic progression and texture on the body all to have the new music language, was the bridge for the development of atonality music.

9 In Mark Eden Horowitz's Sondheim on Music, Sondheim says that when he asked Babbitt if he could study atonality, Babbitt replied "No, I don't think you've exhausted your tonal resources yet."