Piano Piece, Op. 33a (勋伯格：钢琴曲，作品33a)-Charles Rosen

Stravinsky: Serenade in A Major & Piano Sonata - Schoenberg: Piano Pieces, Op. 33 & Suite for Piano, Op. 25

Both movements follow the principles of the twelve-tone technique, according to which a row of twelve tones is selected in order to construct the composition. The row of Op. 33a is 0 7 2 1 11 8 3 5 9 ...