Their musical activities in the 1980s were shaped by the gnaoui mu’allem Mustafa Bakbou and the formation of Tiq Maya. Some consider Bakbou (sometimes written “Baqbou”) to be among the most important and prolific Gnawa musicians in Africa.[citation needed] The group’s line-up changes regularly. Both Sakina Safadi and Mustafa Bakbou left for short periods and then returned. Moulay Abdelaziz Tahiri left for 10 years before making his return. Shortly after Tahiri’s return, Mohamed Derham, long the group’s musical and professional core, dropped out; he now works in a communication agency. Mustafa Bakbou who was taught by his father, Maâlem Ayachi Bakbou and his older brother, Ahmed Bakbou as well as the influential Casablanca maâlem, Maâlem Sam, has now returned to his original work as a gnawa maâlem, and is among the most venerated from the Marrakech school of gnawa. He is one of the stars of the annual Festival Gnaoua et Musiques du Monde in Essaouira, where he is looked after for collaborations, using his experience in Jil Jilala.[citation needed]