Johnny Cash is one of the most iconic artists of all time. But it wasn't his own original music that made Josh Homme cry.

It's easy to earn success recording someone else's song. However, in many cases, cover versions are better than the originals ... covers that we prefer to the original recordings.

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These Bob Dylan covers rival the source material, though diehard Dylan fans would probably disagree with a couple of them.

These covers of classic rock songs by famous 90s bands prove that no matter how old a song is, one can bring it into the modern era.

Seriously, how many vocalists have the range of Robert Plant, or how many guitarists possess the chops to do Jimmy Page justice? With that in mind, here are 20 of the better covers of Zeppelin songs.