well, i think it's a combination. if i remember right - haydn and mozart were friends. they probably played off of one another like birds of a feather - and yet - beethoven took some piano lessons from haydn before he had to go back and take care of his mother...and so had only met haydn and not truly become close friends. do you think beethoven learned as much from haydn as haydn beethoven? even though haydn was much older? they probably learned much from each other.
it is interesting how they all lived around the same time frame. haydn outliving everyone. as i read 'joseph haydn and the classical era' (article found at
www.carolinaclassical.com/articles/haydn.html ) 'gluck, haydn, and beethoven all composed operas that were highly regarded, but it was mozart and rossini who composed the most beloved operas of the time. both were experts at the form of opera buffa (comic opera) and elevated the status of it from low-class entertainment to a very respected art form. one of mozart's last operas, the magic flute, helped to start an important line of german opera, later culminating in the gigantic works of wagner.'
as this article puts it - haydn 'was instrumental in the development of the sonata cycle and helped to establish the tradition of modern orchestral playing.'
when haydn died in 1809, they played the mozart requiem at his funeral. 'his long career enabled him to produce a vast quantity of works that defined the viennese classical style.' unfortunately his coffin was opened and his skull absconded with. it was stolen two days after the funeral. then another skull was sent to the prince to bury in it's place. the real one was bequeathed to the gelsellschaft der musikfreunde (society of the friends of music) in vienna. 'over a century later, in 1932, the reigning prince esterhazy made great efforts to obtain the head for burial with haydn's body in the mausoleum that he had erected in the bergkirche at eisenstadt, but he was not successful, and the skull still remained with the gesellschaft until 1954, when it was finally entombed at eisenstadt on june 6, 1954.'