The Waltz in E minor, B. 56, is a captivating and somewhat melancholic waltz composed by Frédéric Chopin. Unlike many of his other waltzes, it was not published during his lifetime, earning it the "Op. posth." (posthumous opus) designation. Its authenticity was sometimes questioned in the past, but it is now fully accepted into his repertoire. It is characterized by its lyrical melody and reflective mood, offering a more intimate glimpse into Chopin's artistry compared to his grander concert works.