Dang... the mp3 for the nasal voiced guy is gone... and only 5-1/2 years later... gone like snow on the water.
But, seriously folks, I was just sitting with a couple of 3DW recording buddies earlier today talking about nasal singers (we got on that tangent because we'd been talking about a track one of them produced with me singing heh ).
Anyhow, I shared my take on what goes on with a singer like Bob Dylan, Tom Petty or, well, me...
It's not that a guy like Dylan actually sings a true monotone -- you can detect the melody in his singing, even though it doesn't sound particularly differentiated.
Why?
Because, unlike 'classically' trained singers he is not manipulating his vocal mechanism to change his resonance for different part of the melody... his voice box is generating pitch variation -- but his whole system vocal apparatus remains sort of like a fixed, complex filter system, imprinting a more or less steady state sonic imprint on everything that goes through it.
At least, that's my take...