I know KC tried his best and sang all his hit songs. But unfortunately, due to either health issues, smoking, being overweight or Father Time, his voice has changed considerably from when he was much younger and recorded these hits. KC started the concert by saying " I know you are thinking what the hell happened" as a joke to loosen up the audience and make them laugh. Unfortunately, that is just what I thought as I listened to him sing. After the concert, I went home to listen to the original songs to see why the concert seemed so different then what I expected. His voice in the 70's was much better than his current voice. If you are nostalgic and don't really care that much about the purity of the voice, then you will enjoy it. If you want to hear how it originally sounded, then save your money