The lives of Ekrem Resid Rey (10 October 1900-13 July 1959) and Cemal Resid Rey (25 October 1904-7 October 1985) symbolize the transition from Ottoman Empire to Republic of Turkey. Cemal Resid Rey is the first representative of Turkish Five (five composers who pioneered western classical music in Turkey) and he usually worked with his brother Ekrem Resid Rey on stage works. Operetta long existed in urban culture of Ottoman Empire and Rey brothers represented it in Republic Era. While these operettas were highly appraised, operas couldn't gain popularity. There is little information about those operas. In this article, seven operas of Rey brothers; La Femme Fugitive, Faire Sans Dire, Sultan Cem, L'Enchantement, Zeibek, Drame Anatolien and Cekbi will be studied. This study aims to contribute to Turkish opera literature and State Opera and Ballet archive.