original_query: Who was Barbad and what were his roles?
query: Who was Barbad and what were his roles?
answer: Barbad was a Persian poet-musician, lutenist, music theorist, and composer of Sasanian music. He served as chief minstrel-poet under Shahanshah Khosrow II and is considered one of the most significant musicians of his time, even being called the founder of Persian music by some.