Songfacts®:

• "Relentless" was written by James LeBlanc and John Paul White and recorded by Jason Aldean as the third and final single from his 2007 album of the same name. John Paul White was, at the time, a solo artist and had not yet formed the Civil Wars.
• LeBlanc recalled the writing of the song with John Paul White during an interview with The Boot:
  
  "It was just another day in the life of a professional songwriter, where we made appointments with each other and sat down and tried to write a song. It was one of those days.
  
  You never know — or I don't, anyway — which day and which song is going to wind up being 'the one.' I know when I really like something, and I know I really liked 'Relentless,' but it's not enough for me to just really like it. A whole lot of people have to really like it; a song has to go through a bunch of hoops before it gets to the radio.
  
  John Paul White did the demo, and he did a really, really good demo; it sounded awesome. It sounds a lot like the Aldean record... After that, that's about all I really know. It wound up being the title track — that was extra cool."
• The song peaked #15 on the country chart in late 2008. It was the first single of Aldean's career to miss the Top 10.