Ignace Pleyel, often known as Haydn's greatest student, was also one of the most prosperous classical composers. He composed a great deal of music through his life, including a great deal of chamber music. Characteristics reminiscent of Haydn are common in Pleyel's music, particularly in his small ensemble pieces. His duets in particular are very popular for a variety of instrumental combinations, and are known for both parts being equally challenging. - sharmusic.com