I have to respectfully disagree with the notion that Bob Dylan has fallen the furthest...
I personally think Dylan is currently in fine form, has been more relevant than he has been since possibly the 70's and his last few albums have been spectacular. Granted, he has certainly slumped for periods in his career-namely most of the 80's-but his new music is exceptional. I saw him in the 80's and I'll admit he was everything that people love to hate about Dylan...mumbling, sloppy, disinterested, etc. I saw him again a couple of years ago and he was amazing. Charming, musical, coherent and articulate. But don't just take my word for it. Check the reviews on Rolling Stone, AMG, etc of his last few records, they're great.
Has he been consistent throughout his entire career? No. I suppose that happens to a lot of people having worked for 50 years.
Hey, I know, each to his own. But to me, sayin he's fallen to new lows, doesn't hold true.
Besides, in my humble opinion, artists like Dylan and Chuck Berry, etc have cart blanche cause they invented the stuff that ALL the bands you do like, constantly beg, borrow and steal from in order to give you what it is that you do like.
These days, most "good" bands don't have an original thought to start with and those that do, dry up after a record or two.
I only mention this to those that probably stopped following his career a while back and have not heard anything from him lately. To those, I say check out: "Time out of mind", "Love and theft" or the absolutely georgous "Modern Times" (which is stunning on Vinyl)