It's really, really hard to parody something that's already a parody of itself (my theory as to why there are so few Obama impersonators -ed.), but this parody comes close to making the mark. While equally nasally, the 'Dylan' cover is actually bearable.
If you really must see and listen to the original, it is here. But be forewarned - you will most likely be stuffing kitty litter in your ears and ripping out your eyes with knitting needles before it's over.