text: Ziryab is said to have improved the Oud (or Laúd) by adding a fifth pair of strings, and using an eagle's beak or quill instead of a wooden pick. Ziryab also dyed the four strings a color to symbolize the Aristotelian humors, and the fifth string to represent the soul. He is said to have created a unique and influential style of musical performance, and written songs that were performed in Iberia for generations. He was a great influence on Spanish music, and is considered the founder of the Andalusian music traditions of North Africa.
  Ziryab's Baghdadi musical style became very popular in the court of Abd al-Rahman II. Ziryab also became the example of how a courtier, a person who attended aristocratic courts, should act. According to Ibn Hayyan, in common with erudite men of his time he was well versed in many areas of classical study such as astronomy, history, and geography.
  According to al-Tifashi, Ziryab appears to have popularized an early song-sequence, which may have been a precursor to the nawba (originally simply a performer's "turn" to perform for the prince), or Nuba, which is known today as the classical Arabic music of North Africa, though the connections are tenuous at best.
  Abd al-Rahman II was a great patron of the arts and Ziryab was given a great deal of freedom. He established one of the first schools of music in Córdoba. This school incorporated both male and female students, who were very popular amongst the aristocracy of the time. According to Ibn Hayyan, Ziryab developed various tests for them. If a student didn't have a large vocal capacity, for instance, he would put pieces of wood in their jaw to force them to hold their mouth open. Or he would tie a sash tightly around the waist to make them breathe in a particular way, and he would test incoming students by having them sing as loudly and as long a note as they possibly could to see whether they had lung capacity.