The Solo for Piano is part of the legendary "Concert for Piano and Orchestra." It is an indeterminate work, consisting of 63 pages made of 84 different types of composition, each appearing as it's own type of notation. The performer creates his own performance by choosing which pages to play and in which order; pages can also be omitted. Cage began by choosing, using chance operations, a way of composing based on either his Music for Piano series - single notes, or on Winter Music - chords, or aggregates of notes. Chance operations would also determine whether a variation on one of these two types would be used or whether something completely new, with it's own subsequent variations, would be written. When Cage wrote the Two Pieces for Piano (1935), he was already studying with Arnold Schoenberg. Schoenberg's influence on Cage undoubtedly accounts for the music's 12-tone-row-based organization, but Cage's own version of this system had the twelve note series broken down into short pitch/rhythm cells. Later Cage began a study of Indian philosophy and came to believe that the purpose of music is "to imitate nature in it's manner of operation" and "to sober and quiet the mind thus rendering it susceptible to divine influences." These principles underlie another set of piano pieces that Cage wrote in the months May to August, 1946, entitled again, Two Pieces for Piano (1946). These later pieces are more extensively worked out and possess a sense of urgency and heightened drama, brought about in the first piece by long silences and in the second by a quicker flow and variety of musical events distributed over a greater range of the instrument. The silences heard in the first piece are an early example of what later became a pillar of Cage's thought and music - the primacy of silence.