President Obama has led the crowd in a sing-a-long at the end of a concert at the White House paying tribute to the late Ray Charles - despite initially saying that .brPresident Obama has led the crowd in a sing-a-long at the end of a concert at the White House paying tribute to the late Ray Charles - despite initially saying that .brPresident Obama sings at Ray Charles tribute event President Obama has led the crowd in a sing-a-long at the end of a concert at the White House paying .brPresident Obama has led the crowd in a sing-a-long at the end of a concert at the White House paying tribute to the late Ray Charles - despite initially saying that .