"I Walk the Line"

Written by Johnny Cash and recorded for Sun in 1956, 'I Walk the Line' is built on a shifting key and a low hummed pitch that Cash used to find his note. A pledge of fidelity set to the steady boom-chicka pulse, it became his first major crossover hit. The record carried the Memphis studio's reach well beyond rockabilly into the wider pop audience. It remains one of the defining songs of Cash's entire career.