I didn't know he was having any problems with his kidneys or anything else.. I did wonder why he wasn't doing any of those screaming songs that everyone else does and why he wasn't jumping all over the stage but that was what I liked about him. He actually sang to you instead of screaming at you... he was always so calming and relaxing to listen to. I LOVED how he took a old song and changed it up like he did "The Letter"... That was amazing! He is one that made the songs he sang HIS. I kept saying to myself that he was a rare artist, one of the most rarest ones I ever saw..... Now I wonder what part those kidney stones played in that...?