In spring 1826 Thalberg studied with Ignaz Moscheles in London. Moscheles, according to a letter to Felix Mendelssohn of 14 August 1836, had the impression that Thalberg had already reached a level at which no further help would be needed in order to become a great artist. Thalberg's first public performance in London was on 17 May 1826. In Vienna on 6 April 1827 he played the first movement, and on 6 May 1827 the "Adagio" and the "Rondo" of Hummel's concerto in B Minor. After this, Thalberg performed regularly in Vienna. His repertoire was mainly classical, including concertos by Hummel and Beethoven. He also performed chamber music. In the year 1828 his Op. 1, a fantasy on melodies from Carl Maria von Weber's "Euryanthe", was published.