Four.
Brahms composed 21 Hungarian Dances in total.
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Brahms wrote 4 symphonies. He easily could have written more, but it took him over 20 years to write his first, due largely to the incredible shadow left by Beethoven, who Brahms respected immensely..
Symphonies
No.
four
he was 43 years old
Brahms's style of composition was basically romantic in expression within classical structures. If you mean what genres did he compose in, these are the principle ones: Symphonies, concertos, string quartets and other chamber music, songs, sonatas and short pieces for keyboard. He did not compose music for the theatre (operas or ballets).
Six Pieces for Piano, Op.118 - No. 2, Intermezzo in A.
Brahms completed four symphonies.
he was 43 years old