Highlighting Beethoven's quintet for piano and winds in E flat major op 16, by two of the three sonatas for Piano and Clarinet, taken from the abundant work of Johann Baptist Wanhal, Czech Bohemian composer residing in Vienna since 1762, allows us to focus on the contrasts in musical life at the end of the 18th century, with particular reference to the transmission of Mozart's musical heritage, The latter's talent, enriched by the contribution and influence of Bohemian musicians who "trustworthy" then Viennese musical teaching and who, in fact, helped to shape the gift of the Austrian composer (Myslivecek) as Tobias Pfeiffer, another Bohemian pedagogue, that of the early Ludwig.