LONDON – When London rapper Dave took to the stage at the 2020 BRIT Awards last week and performed his politically-charged song "Black" — as a camera projected 3D images of prison bars and newspaper headlines onto his piano's surface — he delivered one of the night's most memorable and talked-about moments.The performance at The O2 came to a climax when the 21-year-old artist, real name David Omoregie, stepped up from his piano stool and launched into in a newly written freestyle verse that saw