The Clarinet Trio in A minor, Op. 114, is one of four chamber works composed by Johannes Brahms featuring the clarinet as a primary instrument. It was written in the summer of 1891 in Bad Ischl for the clarinettist Richard Mühlfeld and first performed privately on 24 November 1891 in Meiningen and publicly in Berlin on 12 December that year. The work calls for clarinet, piano, and cello, and is one of the very few in that genre to have entered the standard repertoire.
Brahms composed the Clarinet Trio in the summer of 1891 while staying in Bad Ischl. The work's composition followed a creative crisis for Brahms, who had grown tired of composing after finishing the difficult revision of his Piano Trio Op. 8. Brahms had even announced to his publisher Fritz Simrock in late 1890 that it was "finally time to quit [composing]". However, Brahms' closer acquaintance with Richard Mühlfeld, the principal clarinettist of the Meiningen Court Orchestra, inspired him to dedicate himself to three new chamber music combinations featuring the clarinet between 1891 and 1894. Brahms had likely first met Mühlfeld in October 1881 during a visit to the court of Meiningen, but their closer collaboration developed ten years later. In letters to friends, Brahms raved about Mühlfeld's playing, writing to Clara Schumann in March 1891: "One cannot play the clarinet more beautifully than Herr Mühlfeld here".
Brahms carried the impressions of his stay in Meiningen with him to his summer holidays in Ischl, and by the end of June, he had completed the first movement of the Clarinet Trio. The composition was finished soon after, and Brahms sent the manuscript to his friend Eusebius Mandyczewski in Vienna, attaching a self-effacing note saying it was "the twin sister of an even bigger folly," referring to the Clarinet Quintet, Op. 115.
After intensive rehearsals and first performances at the court of Meiningen in November 1891 with Mühlfeld, Joseph Joachim, and cellist Robert Hausmann, the Trio was performed in Berlin and Vienna in December. The painter Adolph Menzel attended the Berlin performance on 12 December 1891, with Hausmann on cello and Brahms on piano. Deeply moved by Mühlfeld's playing, Menzel made a sketch of the clarinetist as a Greek god and told Brahms, "We often think of you here, and often enough, comparing notes, we confess our suspicions that on a certain night the Muse itself appeared in person for the purpose of executing a certain woodwind part. On this page I have tried to capture the sublime vision."
Following these performances, Brahms sent the Trio to Simrock for publication in late December. He insisted that "enough cue notes be added" in the clarinet part and made further corrections after a January 1892 performance in Vienna with Joachim. The Clarinet Trio was ultimately published by Simrock in early March 1892.
Although the published title page allowed for a viola to substitute for the clarinet, and Brahms had tried the piece with Joachim on viola during rehearsals, the clarinet was undoubtedly the composer's first choice. The suggestion of the viola alternative was primarily a marketing decision. The work calls for a clarinet in A to reach the low C♯ prominent in the first movement's main theme. Mühlfeld's own clarinet, which still exists, is known for its unusually dark tone and high pitch, just slightly below modern concert pitch.
