Gnawa is a sacred musical tradition rooted in sub-Saharan African spiritual practice, brought to Morocco centuries ago. A full Lila ceremony can last an entire night and involves trance states, colour symbolism and specific rhythms tied to spirits called Mlouk. What you hear at a bar is a secular performance — the same instruments (the sintir bass lute, krakeb castanets, tbel drums) and many of the same melodies, but without the ritual context.
That distinction matters, but it does not make the bar performances lesser. At Café Clock on a Monday night, you may be sitting three metres from a master Gnawa musician who also performs at the Essaouira Gnawa & World Music Festival. The music carries real weight.
If Gnawa is your reason for coming to Marrakech, consider pairing an evening at Café Clock with a day exploring the deeper context through a private guide — understanding what you are hearing transforms the experience.