Drawing on rebetiko's westernization by Tsitsanis and Chiotis, "éntekhno" (or "éntechno") arose in the late 1950s. Éntekhno (lit. meaning 'art song') is orchestral music with elements from Greek folk rhythm and melody; its lyrical themes are often based on the work of famous Greek poets. As opposed to other forms of Greek urban folk music, éntekhno concerts would often take place outside a hall or a night club in the open air. Mikis Theodorakis and Manos Hadjidakis were the most popular early composers of éntekhno song cycles. They were both educated in Classical music and -among other reasons- the lacking of a wide public for this kind of music in Greece, drove them to the invention of Éntekhno, in which they transferred some values of Western art music, such as ballads tune.