Greece contributing to the development of the rebetiko style music in Greece. 1922–1932 In the wake of the Asia Minor Catastrophe and the population exchange of 1923, huge numbers of refugees settled in Piraeus, Thessaloniki, Volos and other harbor cities. They brought with them both European and Anatolian musical instruments and musical elements, including Ottoman café music, and, often neglected in accounts of this music, a somewhat Italianate style with mandolins and choral singing in parallel thirds and sixths. Many of these Greek musicians from Asia Minor were highly competent musicians. Initially an "Athenean Estudiantina" was established with Giorgos Vidalis and some musicians of the old Smyrneiki Estudiantina. Other musicians became studio directors (A&R men) for the major companies, for example Spyros Peristeris (who played mandolin, guitar, piano and later bouzouki), Panagiotis Toundas (primarily a mandolinist) and the violin virtuoso Giannis Dragatsis (Oghdhondakis). The musical personalities of Peristeris and Toundas in particular came to have enormous influence on the further development of recorded rebetiko. While from the middle of the 1920s a substantial number of Anatolian-style songs were recorded in Greece, examples of Piraeus-style rebetiko song first reached shellac in 1931 (see above). 1930s During the 1930s, the relatively sophisticated musical styles met with, and cross-fertilised, with the more heavy-hitting local urban styles exemplified by the earliest recordings of Markos Vamvakaris and Batis. This historical process has led to a currently used terminology intended to distinguish between the clearly Asia Minor oriental style, often called "", and the bouzouki-based style of the 1930s, often called Piraeus style. Also, the use of mandolin totally vanished. By the end of the 1930s rebetiko had reached what can reasonably be called its classic phase, in which elements of the early Piraeus style, elements of the Asia Minor style, clearly European and Greek folk music elements, had fused to generate a genuinely syncretic musical form. Simultaneously, with the onset of censorship, a process began in which rebetiko lyrics slowly began to lose what had been their defining underworld character. This process extended over more than a decade. Metaxas censorship, new directions In 1936, the 4th of August Regime under Ioannis Metaxas was established and with it, the onset of censorship. Some of the subject matter of rebetiko songs was now considered disreputable and unacceptable. During this period, when the Metaxas dictatorship subjected all song lyrics to censorship, song composers would rewrite lyrics, or practice