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In page Rebetiko:

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A comparable development also took place on the vocal side. In 1952 a young singer named Stelios Kazantzidis recorded a couple of rebetika songs that were quite successful. Although he would continue in the same style for a few years it was quickly realized, by all parties involved, that his singing technique and expressive abilities were too good to be contained within the rebetiko idiom. Soon well-known composers of rebetika—like Kaldaras, Chiotis, Klouvatos—started to write songs tailored to Stelios powerful voice and this created a further shift in rebetika music. The new songs had a more complex melodic structure and were usually more dramatic in character. Kazantzidis went on to become a star of the emerging laiki music.