Just discovered (to my shame) his earliest cassettes on Youtube, recording and released when he was about 13 (before his voice broke, it would appear). They're pretty amazing.

http://www.youtube.com/watch?v=6RDaDHxltOI&feature=related
http://www.youtube.com/watch?v=Sf4T5G6e9bM&feature=related
http://www.youtube.com/watch?v=ZtlR2Aexs-o&feature=related

Anymore more links to artists in their formative years? I find it really fascinating.