The guy in the comment-section made probably a mistake, because in Fair Play itself Werrason mentions Thierry Synthe when in came in by saying "Synthé, Synthé, Thierry hein". Thierry Synthe is credited in the credits of Kibuisa Mpimpa as keyboard playeralong with Philliphe Guez. From 1997 to 2000 you had in Maison Mere the late Vasco de Gama who used to play keyboard, but never went on tour with them. Thierry Synthe joined Wenge Maison Mere in 2000 just before the Stade des Martyrs-event (concert de correction) after having participated in Zaiko's Poison and touring with them in Europe. Towards 2005 he left Maison Mere to join Bill Clinton's band after being left behind for an Europe-tour where Chevignon Synthé took his place. In 2009 he returned and left again in 2013 to start his solo-career. Thierry's memorable partitions are the one of Double Zenith, Tavé Katanga when the sebene came in, Fair Play, Matshuda Mandangi of their concert in Canfunfu and Werra's entrance at Bercy when Flamme stops playing lead.
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