The latter two groups represented the beginning of rap in Mongolia. Their songs mostly stressed social issues, philosophy and rebellious ideas. A later generation consisted of bands like Dain Ba Enkh, 2 Khüü, Erkh-Chölöö, Lumino, Mon-Ta-Rap, Ice Top, Odko, Gee, Quiza, B.A.T and URMC. They continued with similar messages as their predecessors but also came to include “soft” touches in their songs, which faced strong resistance from hardcore rap fans but were welcomed by the general public. Popular folk music There is also a long established and distinctive "Mongolian pop" genre that occupies the same place on the musical spectrum as Japanese Enka music or Western soft-pop-oriented folk music or country music. Classic singers from the late 20th and early 21st centuries include Vandan and Dulamsüren, Batsükh, Tömörkhuyag and Egschiglen. Some of the repeatedly heard lyrical themes are very distinctive for Mongolia: heartfelt tributes to the songwriter's mother, for example, or paeans to great horses. Mongolian popular folk music is not considered world music in the west and was long generally unavailable outside Mongolia, but can now be downloaded from various Mongolian websites. It may be filed under the designation Zohioliin Duu (Зохиoлын Дyy) (schlagers). In the Mongolian language, duu means song; and the genitive word zohioliin derives from the noun for a literary composition. A typical zohioliin duu may include three four-line stanzas and a refrain. The lyrics of zohioliin duu, like those of Mongolian folk poetry, tend to be alliterative. Often, the lines of a zohioliin duu share not only initial letters, but also initial syllables. Classical music Mongolia features a rich tradition of classical music and ballet. The classical music owes its prosperity in the 2nd half of the 20th century to a patronage of then Socialist government that favoured Western and Russian/Soviet classical arts to Western pop culture. In addition, the Mongolian composers developed a rich diversity of national symphony and ballet. Musical Instruments Horse-head fiddle The horse-head fiddle, or morin khuur, is a distinctively Mongolian instrument and is seen as a symbol of the country. The instrument has two strings. There is some controversy regarding the traditional carving of a horse on the upper end of the pegbox. Some scholars believe that this is proof that the instrument was originally a shamanistic instrument. The staffs of shamans have a horse similarly carved on top; the horse is a much-revered animal in Mongolia. Other traditional instruments