Moser (p. 28 ff.) writes "After the appearance of the six String Quartets (Op. 18) Beethoven had complete command of the field of chamber-music", although in the later quartets he "makes many exacting demands" of string players. Moser (p. 29) further writes that "at the time of Beethoven's death", such people as Spohr and Hauptmann did not necessarily esteem the late quartets above the earliest ones. Moser, p. 30 writes that in Vienna "the public showed a marked hostility toward" the late quartets. But Joachim's teacher Böhm had an appreciation of the late quartets, which he communicated to Joachim. At the age of 18, "in the whole of Germany" Joachim had no equal, either in the rendering of Bach or in the concertos of Beethoven and Mendelssohn; while as quartet player, "he had no cause to fear rivalry."