Trying to pick the very best Johnny Cash song is a bit like trying to find a needle in a haystack: It's incredibly time-consuming, and almost completely futile; because his catalog is so deep, it's hard to come to an agreement.

Cash's songs are some of music's most iconic. His career, which began in the rock world at the legendary Sun Records, touched not only rock and country, but also folk. Even later in life, Cash was able to remind fans why they fell in love with his music in the first place, and make new listeners want to go deeper into his work.

Which of Cash's songs is your personal favorite? Vote in the poll below -- you can vote as often as once per hour -- and if you don't see your favorite listed (because listing them all would have taken forever!), share your pick with us in the comments section.

Unforgettable Johnny Cash Moments