I have heard comments that hearing Dylan’s voice is “worse than cancer”. I believe such comments are un-necessarily harsh. Remember “Lay Lady Lay”? Didn’t that border on melodic? OK, I rest my case. He was terrible most of the time, not all of the time.
On the other hand, Willliam Shatner has no business deviating from his acting day job. If God hands us only one great talent in our lives, be it singing, song writing, playing an instrument, acting, writing, and so on, we ought to make the most of it and count our blessings, since it is these limited talents alone that place us already above the crowd. It is rare that people are successful in more than one talent, and when it is usually attempted, the result is often, uh, humbling for the performer. And unintentionally amusing for the audience.
To illustrate the over-reaching kind of talent, here is William Shatner talking over “Hey Mr. Tambourine Man”.