"Crazy" is a song written by Willie Nelson and popularized by country singer Patsy Cline in 1961. Nelson wrote the song while living in Houston, working for Pappy Daily's label D Records. He was also a radio DJ and performed in clubs. Nelson then moved to Nashville, Tennessee, working as a writer for Pamper Music. Through Hank Cochran, the song reached Patsy Cline. After her original recording and release, Cline's version reached number two on Billboard's Hot Country Singles, also crossing to the pop chart as a top 10 single.

Cline's version is considered a country music standard and, in 1996, became the all-time most played song in jukeboxes in the United States. "Crazy" was covered by many artists; different versions reached the charts in a variety of genres. The song was featured in television shows, while many publications have included it in their all-time best songs lists. The Library of Congress inducted Cline's version into the National Recording Registry in 2003.

Country (also called country and western) is a genre of popular music that originated with blues, church music such as Southern gospel and spirituals, old-time, and American folk music forms including Appalachian, Cajun, Creole, and the cowboy Western music styles of New Mexico, Red Dirt, Tejano, and Texas country. Its popularized roots originate in the Southern and Southwestern United States of the early 1920s.

Country music often consists of ballads and dance tunes (most commonly known as "Honky Tonk music") with generally simple forms, folk lyrics, and harmonies often accompanied by string instruments such as banjos, electric and acoustic guitars, steel guitars (such as pedal steels and dobros), and fiddles as well as harmonicas. Blues modes have been used extensively throughout its recorded history.The term country music gained popularity in the 1940s in preference to hillbilly music; it came to encompass Western music, which evolved parallel to hillbilly music from similar roots, in the mid-20th century. In 2009, in the United States, country music was the most listened to rush hour radio genre during the evening commute, and second most popular in the morning commute.The term country music is used today to describe many styles and subgenres. The origins of country music are found in the folk music of working class Americans and blue-collar American life. It has been inspired by American popular music, and American folk music which had its roots in Celtic music, early music of the British Isles, singing cowboys, corrido, ranchera, norteño, French folk music, African-American music, and other traditional folk music traditions.