Joyful, dramatic, intense or light-hearted, the keyboard trio occupies a significant place in the output of Joseph Haydn. Some forty years separate his Trio in G minor from the Trio op.22 of Johann Nepomuk Hummel, that remarkable virtuoso whose melodic gift won him the admiration of Mendelssohn. These works testify to the continuous development of a form that evolved in parallel to the sonata. They also allow us to bring together two composers who were in regular contact at the court of the Esterházy princes.