I listen to the original version of Sit Down You're Rocking the Boat on Youtube, completely different from Don's version.

As I listen to all the covers Don has done, they sound so different from the original and sometimes better than the original. For example, Everybody Knows. Don had completely re-arrange the music of the song. I listened to Leonard Cohen's version and I was like, "what?!!!" It was completely different.

I don't know who does the re-arranging of the songs Don covers, but they do a great job.