Amongst the most beautiful pieces found in the Turkish musical tradition are the Nefes (hymns) of the Bektaci order of dervishes. This order was founded in the 13th cent., inspired by the Anatolian mystic Haci Bektac Veli, and continues up until the present time. Contrary to the more well-known order of Mevlevi Dervishes, who were usually concentrated in the urban centers, where they made an enormous contribution to Ottoman classical music, the Bektacis were [bad word] people whose music tended to conform to the forms of the folk music of the provinces. Almost all of the Aciks of Turkey (wandering bards who sung and played the folk-lute saz) belonged to this order, and, even today, they p:lay a very important role in the lives of the inhabitants [bad word] Turkey. Bektaci Nefes are usually very simple and clear melodies of striking beauty and, perhaps for that reason, in Turkey, even ordinary people, who are not members of the Bektaci order, are especially fond of them and know how to sing them.