I became an American President after William McKinley was assassinated. Singer and songwriter, Bill Withers, sang about me, I know, in one of his songs. To most basketball fans, I am considered the GOAT. Without me, it would be unlikely to compose an accurate or complete description of who I am. I was there at the beginning, when the Modern Olympic Games began in 1896. But officially, not until 1908 games did I become the standard. What am I?