metamitya ·
2. **Jazz and Hipster Culture**: The modern concept of "cool" gained prominence in the 1920s and 1930s within the jazz scene. Jazz musicians and their fans used "cool" to describe not only the music but also a certain attitude of detachment, calmness, and nonchalance. This usage was further popularized by the hipster culture of the 1940s and 1950s, which emphasized a laid-back, unaffected demeanor.