Hindustani Vocal music is the classical form that has been evolving since the 12th century C.E. from the regions of northern India, Pakistan, Bangladesh, Nepal and Afghanistan. The tradition was born from a cultural synthesis of several musical streams: the Vedic chant tradition dating back to approximately one millennium B.C.E., the equally ancient Persian tradition of Musiqi-e assil, and also folk traditions prevalent in the region. The term Shaastriya sangeet for north Indian classical music is also occasionally used. Hindustani Vocal focuses mainly on melodic development, improvisation and exploring all aspects of a raaga.