The two crossword solutions for the term 'Rossini Opera' are 'Otello' (6 letters) and 'Tancredi' (8 letters). Gioachino Rossini was an Italian composer who wrote 39 operas during his lifetime. 'Otello' is a four-act opera based on William Shakespeare's play of the same name, which premiered in 1816. 'Tancredi' is a two-act opera based on Voltaire's play 'Tancrède', which premiered in 1813. Both operas are considered to be some of Rossini's most successful works.