Since SP started out his musical career as a drummer, does anyone know if he took voice lessons as a kid? It's obvious he had the ultimate natural vocal abilities, but how did he get to the pinnacle? I'm sure after he hit the big time, there were vocal coaches to help with the rigors of touring, but the Escape-era vocals were, and are (IMHO) unsurpassed by anyone since.
However, I have to admit, I do prefer the Frontiers and beyond SP vocals...