In music theory, this number's Roman numeral labels the mediant chord.
Henryk Gorecki's symphony of this number is the Symphony of Sorrowful Songs. In music theory, this number's Roman numeral labels the mediant chord. A Mozart piece for this many musicians is called "Kegelstatt." Mahler's symphony of this number features the alto solo "O Mensch" and, with its six movements, is his longest. A typical Classical-era concerto contains this many movements. Beethoven's E-flat major symphony of this number is called "Eroica." For 10 points, how many musicians would you need to play the Brahms Horn Trio?
Henryk Gorecki's symphony of this number is the Symphony of Sorrowful Songs.
three [accept equivalents such as "the third"]