The guy dancing like he's drunk at 57:41 mark is Sonor Digital. Remember, back in the early days of Extra Musica he had his start as a backup dancer while he trained to become a better rhythm guitarist and bassist. In the months leading to the split, you can already see Sonor playing as alternate for Durell Loemba or Espe Bass at concerts before he settled in as Durrell's replace by the time of the split.As for the singer at 54:41, that's Kerson Saddam. He is originally from Z1 International, he sings at the very beginning of their generique from 2000. He was there in the group with Levyson as well, even touring in Europe with that group. I'm not sure what happened, but he left shortly thereafter. You can even see him in Extra Musica Zangul as early as 2002 since he interprets Papy Jah's vocals on the clips for Trop C'est Trop filmed in Brazzaville like Probleme Sur Probleme and 12 Balles. After Universal Zangul split, I'm not sure what became of him.