The Thirteen Canons, Op. 113 are a collection of works for female unaccompanied chorus composed over the course of a number of years (most likely written while employed as director of a Hamburg woman's choir) and finished off and first published in 1891.Brahms alludes to his admired predecessor Schubert in No. 13 with a quote from the song Der Leiermann from Die Winterreise. - the publisher