ONB are one of the best live world music acts I have ever seen, if not THE best. Their blend of Rai, Reggae and Rock has a contageous energy and you can seldom leave one of their gigs without joy in your heart and a smile on your face. Their effectiveness depends on crowd particpation and the O2 Indigo, with upstairs seating, out of the performers' direct eyeline and a dance floor below fenced off by security is not ideal for their more musically intimate purposes. Believe it or not, the Royal Festival Hall is far better for them. Bring them here again, and again, and again, ad infinitum and soon... but give them a night or two at the Royal Festival Hall and give us, and them, the wonderful night they deserve. Mehdi, Ahmed and Yucef, toute a l'heure, mes amis!