Bruckner's symphonies are scored for a fairly standard orchestra of woodwinds in pairs, four horns, two or three trumpets, three trombones, tuba (from the second version of the Fourth), timpani and strings. The later symphonies increase this complement, but not by much. Notable is the use of Wagner tubas in his last three symphonies. Only the Eighth has harp, and percussion besides timpani (though legend has it the Seventh is supposed to have a cymbal crash at the exact moment Wagner died. Bruckner's style of orchestral writing was criticized by his Viennese contemporaries, but by the middle of the twentieth century, musicologists recognized that his orchestration was modeled after the sound of his primary instrument, the pipe organ, "i.e.", alternating between two groups of instruments, as when changing from one manual of the organ to another.