ALEXIS AKWAGYIRAM and ANGELA UKOMADU MODERN African music is altering perceptions of the continent as part of a global cultural shift that marks a "big moment", Nigerian music artist Burna Boy told Reuters after hailing his first Grammy award. Burna Boy was awarded a Grammy for the Best Global Music Album this month for 'Twice As Tall' which was released last year. He is part of a generation of Nigerian music artists, which include Wizkid and Davido, that has enjoyed global success in recent years as proponents of the Afrobeats sound. The African genre is now almost as likely to…