The Piano Trio in B-flat major, Op. 11, was composed by Ludwig van Beethoven in 1797 and published in Vienna the next year. It is one of a series of early chamber works, many involving woodwind instruments because of their popularity and novelty at the time. The trio is scored for piano, clarinet (or violin), and cello (sometimes replaced by bassoon). The work is also sometimes known by the nickname “Gassenhauer Trio”. This arose from its third movement which contains nine variations on a theme from the then popular dramma giocoso L’amor marinaro ossia Il corsaro.