young pupil's early friends: After leaving Vienna, Adorno traveled through Italy, where he met with Kracauer, Benjamin, and the economist Alfred Sohn-Rethel, with whom he developed a lasting friendship, before returning to Frankfurt. In December 1926 Adorno's "Two Pieces for String Quartet", op. 2, were performed in Vienna, which provided a welcome interruption from his preparations for the habilitation. After writing the "Piano Pieces in strict twelve-tone technique", as well as songs later integrated into the Six Bagatelles for Voice and Piano, op. 6, Adorno presented his habilitation manuscript, The Concept of the Unconscious in the Transcendental Theory of the Psyche (Der Begriff des Unbewußten in der transzendentalen Seelenlehre), to Cornelius in November 1927. Cornelius advised Adorno to withdraw his application on the grounds that the manuscript was too close to his own way of thinking. In the manuscript Adorno attempted to underline the epistemological status of the unconscious as it emerged from Freud's early writings. Against the function of the unconscious in both Nietzsche and Spengler, Adorno argued that Freud's notion of the unconscious serves as a "sharp weapon ... against every attempt to create a metaphysics of the instincts and to deify full, organic nature." Undaunted by his academic prospects, Adorno threw himself once again into composition. In addition to publishing numerous reviews of opera performances and concerts, Adorno's "Four Songs for Medium Voice and Piano", op. 3, were performed in Berlin in January 1929. Between 1928 and 1930 Adorno took on a greater role within the editorial committee of the Musikblätter des Anbruch. In a proposal for transforming the journal, he sought to use Anbruch for championing radical modern music against what he called the "stabilized music" of Pfitzner, the later Richard Strauss, as well as the neoclassicism of Stravinsky and Hindemith. During this period he published the essays "Night Music", "On Twelve-Tone Technique" and "Reaction and Progress". Yet his reservations about twelve-tone orthodoxy became steadily more pronounced. According to Adorno, twelve-tone technique's use of atonality can no more be regarded as an authoritative canon than can tonality be relied on to provide instructions for the composer. At this time Adorno struck up a correspondence with the composer Ernst Krenek, discussing problems of atonality and twelve-tone technique. In a 1934 letter he sounded a related criticism of Schoenberg: At this point Adorno reversed his earlier priorities: now his musical activities came second to the development of a