There were various subjects involved in khayal ras which required ample improvisations in order to translate it in instrumental music. At first Alap, the slow but contemplative progression of a raag, was given a different approach adorned with meend, krintan and zamzama. Next were taans and bol taans, the fast tempo phrases, and thumri. The transition towards khayal ras is quite evident in Vilayat Khan’s recordings from 60’s onwards.