has put together a very interesting, accurate chart involving the vocal ranges of the world's greatest and most popular singers.

Do you think Luke Bryan is a good singer? How about Taylor Swift or Johnny Cash? There's a lot more to a great singer than just their range, but some of the most powerful singers in the world tend to be great. It may shock you to see where these famous country musicians fall in this chart.

"Vocal range is a great indicator of a vocalist's talent, but there is much more that goes into it: tone, creativity in melody composition, lyrics and dynamic abilities, to name a few. It also helps when a vocalist has a great band or composition behind them," according to the Huffington Post.