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
Symphony No. 4 (Nielsen) Symphony No. 4 (Nielsen) Symphony No. 4, Op. 29, FS 76, also known as "The Inextinguishable" (), was completed by Danish composer Carl Nielsen in 1916. Composed against the backdrop of the First World War, this symphony is among the most dramatic that Nielsen wrote, featuring a "battle" between two sets of timpani. Nielsen was thinking about a new symphony in 1914, and in May he wrote to his wife (who was in Celle): I have an idea for a new composition, which has no programme but will express what we understand by the spirit of life or manifestations of