During Islamic rule under the Delhi Sultanate, a cultural change began. Traditionally, music was rooted in outside influence. However during this period, music began to adopt local flair from the Hindu culture. The fusion of Hindu and Muslim styles brought forth new musical forms such as gawwali and khyal. Amir Khusrau, often called the father of modern Hindustani classical music, introduced several ragas (a pattern of notes using intervals, rhythms and embellishments) such as Ghora, Sanam, Yaman, Kalyan, Zeelaf and Sarpada. He blended the Hindu and Iranian musical traditions together to form a new style of light music called gwalis. Instruments such as the table, sarangi, rabab and sitar were introduced during this time period. Court musician for Muhammad Shah, Sadarang, is believed to have developed the modern form of khyal during the Sultanate Period. PirBhodan, a Sufi saint, was also a great musician of this time.