Which composer had a long standing business relationship with a major piano manufacturer and endorsed its instruments?

Frédéric Chopin had a long-standing business relationship with the piano manufacturer Pleyel. He endorsed their instruments and often performed on Pleyel pianos, which were known for their quality and craftsmanship. Chopin's association with Pleyel helped enhance the brand's reputation and contributed to the popularity of their pianos during his time.