it is not about the 'look'.
It is not about the 'voice'.
It is how you feel when you sing the song, and how to express that feeling to your audience that matters. What is a tribute artist, as opposed to a cover artist or an imitation artist?
Not everyone can sing every John Denver song, but most people can sing one or two, and a selection of people can sing a lot of the songs that are synonymous with John Denver. Here are some favourites.
Click the name to link to a tribute artist's website, where you will find a schedule of forthcoming events.