Patsy Cline was not really a country singer.
At least that's what some people say. Her voice, at least in the view of long-time producer Owen Bradley, was best suited to the smooth tone of pop music in the 1950s and 1960s.
Still, Patsy herself was country through and through. She had always wanted to sing country music, and when she first started recording with Decca Records, she resisted Bradley's attempts to add thick instrumentation and back-up singing from the flashy group the Jordanaires, who also sang with Elvis.
But it was just that soft, sweet country music, light on twang and heavy on romance, that would come to define "the Nashville sound."
Remember, at the time when Patsy Cline was recording, the type of music she sang was still called "hillbilly music." Along with others at Decca, RCA, and Columbia Records, Bradley aimed to revise the bare honky-tonk sound that was popular in the early 1950s into something with more popular appeal. Although she appeared on the scene late in the game, Patsy Cline's diva-esque voice was a perfect fit for the Nashville sound.
Now, the Nashville sound is just a part of country music. And a whole lot of country music doubles as pop music. So, even though nothing really stands out to us now about the instrumentation on "Crazy," its popularity back then affirmed the success of that now-classic style and helped it make its way well into the mainstream.