Over the years 1825–1849, Frédéric Chopin wrote at least 59 Mazurkas for piano, based on the traditional Polish dance: * 58 have been published * 45 during Chopin's lifetime, of which 41 have opus numbers (with the remaining four works being two early mazurkas from 1826 and the famous "Notre Temps" and "Émile Gaillard" mazurkas that were published individually in 1841) * 13 posthumously, of which 8 have posthumous opus numbers (specifically, Opp. 67 & 68) * 11 further mazurkas are known whose manuscripts are either in private hands (2) or untraced (at least 9).