It was about a year ago that Garth Brooks was on stage with Justin Timberlake at Nashville's Bridgestone Arena helping the new king of pop sing one of Garth's most iconic hits, "Friends in Low Places."

Having attended a few concerts in my day (like 10 to 15 a year), I always enjoy it when different artists cover some of the biggest hits. Luke Bryan usually covers Metallica's "Enter Sandman," which would have most rock purists losing their damn minds. Eric Church covers Lynyrd Skynyrd, a group that is not easily replicated. In fact, a lot of artists tap different genres to mix in a fresh element to their show.

When Justin Timberlake started rolling some Garth Brooks, I had my doubts. No one sounds like Garth but Garth, and it's a good thing JT had the legendary country music singer walk out and surprise the crowd by joining in on the party song. I have no doubt that Justin Timberlake could have gotten through the song on his own, but it's Garth Freaking Brooks. One person who would be extremely difficult to cover.

But with Garth's help, JT pulled it off.

So as a fan of music, who are some artists whose songs should be left alone? Was Timberlake out of line covering Garth Brooks? What about Elvis? Or George Strait? Who do you think should never be covered at a live show?

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