Mahler's third and fourth symphonies mark a turning point in his development as a composer. Symphony No. 3 (1896) predominantly follows the musical style of the earlier two symphonies, which tended to emphasize a single melodic line with subordinate harmonies. Symphony No. 4 (1900) embodies the more contrapuntal style that characterizes his later symphonic works. At the same time, these works bring Mahler to the end of his "Wunderhorn years," when...