From www.mutopiaproject.org

Sixteen Waltzes, Op. 39 is a set of 16 short waltzes for piano four hands written by Johannes Brahms. They were composed in 1865, and published two years later, dedicated to Eduard Hanslick. These waltzes were also arranged for piano solo by the composer, in two different versions – difficult and simplified. The three versions were published at the same time, and sold well, contrary to the composer's expectations. In the solo versions, some of the keys were altered from the original duet version (the last four in the difficult version and No. 6 in the easy version). Waltz Number 15 in A major (or A-flat major) has acquired a life of its own. An arrangement of five of the waltzes (Nos. 1, 2, 11, 14, and 15) for two pianos, four hands was published after the composer's death.
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