Chopin Waltz in E-flat major, B. 133

Frédéric Chopin wrote his Waltz in E flat major in 1840, though it was only published in 1955. It has the tempo indication sostenuto, and the dedication is to Émile Gaillard. It is usually referred to as B. 133 and, being one of Chopin's most obscure works, it is not always classified in the waltz category.