Notable modern Greek artists include Renaissance painter Dominikos Theotokopoulos (El Greco), Panagiotis Doxaras, Nikolaos Gyzis, Nikiphoros Lytras, Yannis Tsarouchis, Nikos Engonopoulos, Constantine Andreou, Jannis Kounellis, sculptors such as Leonidas Drosis, Georgios Bonanos, Yannoulis Chalepas and Joannis Avramidis, conductor Dimitri Mitropoulos, soprano Maria Callas, composers such as Mikis Theodorakis, Nikos Skalkottas, Iannis Xenakis, Manos Hatzidakis, Eleni Karaindrou, Yanni and Vangelis, one of the best-selling singers worldwide Nana Mouskouri and poets such as Kostis Palamas, Dionysios Solomos, Angelos Sikelianos and Yannis Ritsos. Who sang in a voice that is in the high octave range from the Modern Greek Era ?