It sold approximately four million copies worldwide and received more than eight million airplays .
It became Redding 's only single to reach number one on the Billboard Hot 100 and the first posthumous number - one single in U.S. chart history .
Redding sold approximately four million copies worldwide and received more than eight million airplays .
It became Redding 's only single to reach number one on the Billboard Hot 100 and the first posthumous number - one single in U.S. chart history .