Al-Haj 'Abd al-Karim al-Rais & the Brihi Ensemble from Fes, the most famous ensemble of Arabo-Andalusian music, which is the classical music of Morocco. Here you can read more about this tradition and 'Abd al-Karim al-Rais (in French).
Nouba 'Iraq Al-'Ajam, Inshad (Solo vocal improvisation) by Abdel Fattah Bennis (30:32)
Nouba Al-Isbihan, Mawwal (Solo vocal improvisation) by Abdel Majid Bouzwadah (?) (30:21)