Adriaan - now that you mention it, I recall that a piano/harpsichord player I dated when the world was young made a point of differentiating her perfect pitch from her perfect ear - my bad.
 
Mark - I knew there was some dubbing, but never knew what - though I guess it makes sense that if you're dubbing a Dead performance, you'd start w/the vocals.
 
I also love Dylan's singing - and Neil Young, and Kristofferson, and all those 90-year-old blues and bluegrass and old-timey cats that still do it, wavering but real.  What can I say?  It does it for me more than polish does.
 
Peter

I thought perfect pitch was tossing a banjo in the wastebasket, and not hitting the sides.
 

I used to play off and on with a woman in the Chicago area who had perfect pitch. She taught at one of the colleges. She would notice very quickly when someone was not on pitch when we played. The surprising thing is she liked Dylan and his singing voice a lot. Even though he was not always on pitch she said his technique (or lack of) was perfect for the song. Go figure.  
 
Keith

Bradley, the way I see it the banjo needs to miss the waste basket completely. ;-)
 
Anyway - my wife doesn't have perfect pitch, but when we're listening to any music where a vocalist or instrumentalist is off-pitch, we both cringe - at least if the music is of the kind where pitch goes before expression.