Out of curiosity, isn't MJ's voice supposed to be around it's "prime" around now? I think I read somewhere that vocally, he would have been in his prime from age 35 or something up through now... I don't know, I might be grasping for random numbers, but I feel like some vocal coach said that.
Personally, I love how smooth & sweet his voice sounded around OTW, but as everyone else has said, his voice hasn't changed in quality. Perhaps tone a slight bit, but it also depends on the style MJ's doing. I really love how his voice sounded on the Invincible ballads -
- yup, just like "Butterflies". Oh man, I just swoon like crazy every time he gets to that part! It's absolutely incredible. Same goes for "Someone Put Your Hand Out" (now was that a Dangerous outtake? I forget). And that entire song is done in his 'head' voice, I believe which is crazy hard (or so my singer friend says). So over the years he's maintained an excellent voice, but I guess how often he makes use of his angelic voice vs. his grittier one is dictated by the song. No matter what he sounds fantastic. So I guess I can't decide ^_^.