A struggling country singer, Willie Nelson, wrote "Crazy" and got a big break when Patsy Cline recorded the song and made it a hit. It has become one of Nelson's most enduring songs.
Other artists who have covered the song include Willie Nelson, Dottie West, Vic Damone, Ray Price, Wanda Jackson, Linda Ronstadt, Julie Andrews, B.J. Thomas, Kidneythieves, Crystal Gayle, and Diana Krall.
The piano intro is basically a single-line melody with several "slip notes" or "bent notes" outline chords in the Bb scale.
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