The Hungarian Dances () by Johannes Brahms (WoO 1), are a set of 21 lively dance tunes based mostly on Hungarian themes, completed in 1879. They vary from about a minute to five minutes in length. They are among Brahms's most popular works and were the most profitable for him. Each dance has been arranged for a wide variety of instruments and ensembles. Brahms originally wrote the version for piano four hands (piano duet: two players using one piano) and later arranged the first ten dances for solo piano. Background In 1850 Brahms met the Hungarian violinist Ede Reményi and accompanied him in a number of recitals over the next few years. This was his introduction to "gypsy-style" music such as the csardas, which was later to prove the foundation of his most lucrative and popular compositions, the two sets of Hungarian Dances (published 1869 and 1880). Only numbers 11, 14 and 16 are entirely original compositions. The better-known Hungarian Dances include Nos. 1 and 5, the latter of which was based on the csárdás "" (Memories of Bártfa) by Hungarian composer Béla Kéler, which Brahms mistakenly thought was a traditional folksong. A footnote on the Ludwig-Masters edition of a modern orchestration of Hungarian Dance No.1 states: "The material for this dance is believed to have come from the Divine Csárdás (ca. 1850) of Hungarian composer and conductor Miska Borzó." List Book 1. (published in 1869) in G minor: Allegro molto in D minor (orch. Hallén, 1882): Allegro non assai – Vivace in F major: Allegretto in F minor (F minor in Juon's 1933 orchestration): Poco sostenuto – Vivace in F minor (G minor in Parlow's 1885 orchestration): Allegro – Vivace Book 2. (published in 1869) in D major (D major in Parlow's 1885 orchestration): Vivace in A major (F major in Brahms's solo piano arrangement): Allegretto – Vivo in A minor: Presto in E minor: Allegro ma non troppo in E major (F major for orchestra): Presto Book 3. (published in 1880; Parlow's orchestrations of these six were made in 1885 without any change of key) in D minor: Poco andante in D minor: Presto in D major: Andantino grazioso – Vivace in D minor: Un poco andante in B major: Allegretto grazioso in F minor: Con moto – F major: Presto Book 4. (published in 1880; Dvorak's orchestrations of these five were made in October and November of