Identify the disciple of Shaikh Nizamuddin Auliya with the help of the following information:
1. He was a great poet and musician of the medieval period.
2. He gave a unique form to Chishti sama.
3. He introduced qawwali.
Amir Khusrau, a disciple of Shaikh Nizamuddin Auliya, is renowned as a versatile genius of the medieval period. He is credited with introducing qawwali and enriching Indian music and poetry.