Although Johnny Cash was Sun Records most consistently best-selling artist 
at that time, he felt constrained by his contract with the small label, Elvis Presley  
had already left Sun, and Sun Records owner/producer Sam Phillips was focusing  
most of his attention and promotion on Jerry Lee Lewis. The following year Cash  
left the label on August 2, 1958 to sign a lucrative offer with Columbia Records, 
where his single "Don’t Take Your Guns to Town” became one of his biggest hits.