George Floyd's memorial service on Tuesday, struggling at times to get through the song as he sang through tears.The R&B performer took the stage to perform the heartfelt farewell song a cappella for the crowd at the final memorial service for the late Minneapolis man, whose death after being pinned down at the neck by police officer Derek Chauvin has sparked Black Lives Matter protests around the word.When he got choked up mid-chorus — pausing to drop his head and clear his throat in the midst