Johnny Cash scored his very first No. 1 hit in 1957 with 'I Walk the Line.' The track introduced the world to Cash's trademark freight train rhythm, helping invent the rockabilly sound that allowed Sun Records to dominate that era of music. 'I Walk the Line' would go on to appear on Cash's definitive live album 'At San Quentin,' and would inspire the title of the movie based on his life and career.

Cash wrote the song backstage one night after a concert. The newly-married star was making a promise that he would hold his marriage vows sacred -- a timeless theme that earns the song a spot in our Top 100 Country Love Songs list: "Because you're mine, I walk the line."

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Listen to 'I Walk the Line' by Johnny Cash