Symphony instruments, 19th century symphonies were gradually augmented with more string players and more wind parts, so that the orchestra grew substantially in sheer numbers, as concert halls likewise grew. At the beginning of the 20th century, Gustav Mahler wrote long, large-scale symphonies. His Eighth Symphony, for example, was composed in 1906 and is nicknamed the "Symphony of a Thousand" because of the large number of voices required to perform the work. Additionally, his Third Symphony is one of the longest regularly performed symphonies at around 100 minutes in length for most performances. The 20th century also saw further diversification in
A Sea Symphony completed "A Sea Symphony", including two with chorus; the vast majority of those are juvenilia or apprentice works that have never been published and are long since withdrawn from circulation. Nevertheless, Vaughan Williams had never before attempted a work of quite this duration, or for such large forces, and it was his first of what would eventually be nine symphonies. Like Brahms, Vaughan Williams delayed a long time before composing his first symphony, but remained prolific throughout the end of his life: his final symphony was composed from 1956–58, and completed when he was 85 years of age. At approximately