With the assimilation of immigrants from various regions the diversity of musical genres and musical instrumentation also expanded. Turkey has also seen documented folk music and recorded popular music produced in the ethnic styles of Greek, Armenian, Albanian, Polish, Azeri and Jewish communities, among others. Many Turkish cities and towns have vibrant local music scenes which, in turn, support a number of regional musical styles. Despite this however, western-style pop music lost popularity to arabesque in the late 1970s and 1980s, with even its greatest proponents, Ajda Pekkan and Sezen Aksu, falling in status. It became popular again by the beginning of the 1990s, as a result of an opening economy and society. With the support of Aksu, the resurging popularity of pop music gave rise to several international Turkish pop stars such as Tarkan and Sertab Erener. The late 1990s also saw an emergence of underground music producing alternative Turkish rock, electronica, hip-hop, rap and dance music in opposition to the mainstream corporate pop and arabesque genres, which many believe have become too commercial.