Out of Italian Gaetano Donizetti or Czech Bedřich Smetana, which opera composer lived and worked earlier?
Gaetano Donizetti Domenico Gaetano Maria Donizetti (] ; 29 November 1797 – 8 April 1848) was an Italian composer. Along with Gioachino Rossini and Vincenzo Bellini, Donizetti was a leading composer of the "bel canto" opera style during the first half of the nineteenth century. Donizetti's close association with the bel canto style was undoubtedly an influence on other composers such as Giuseppe Verdi (1813–1901).
Milanese Quartets (Mozart) The six string quartets, K. 155–160, were composed by Wolfgang Amadeus Mozart in late 1772 and early 1773. Because they were composed in Milan while he was working on his opera Lucio Silla, they are popularly known as the Milanese Quartets. Before this set was composed, Mozart had written one earlier string quartet (K. 80/73f in 1770), so these six quartets are ordinally numbered from No. 2 to No. 7. The quartets are written in a plan of keys of D-G-C-F-B♭ -E♭ following the circle of fifths.