Which do you prefer, folk songs or jazz?

Jazz gives me the feeling of being free, relaxed, casual and lazy.

In jazz, vibrato changes, the direction of change is generally from narrow to wide, and the speed is from slow to fast. The amplitude and speed of vibrato are often increased near the end of a note, which further strengthens the expressive force of this technique. At the same time, at the beginning of a note, the jazz musician will slide to the predetermined pitch from bottom to top, and then slide down from the original pitch at the end. These changes can't be recorded in detail by music. Experienced jazz musicians have mastered this method, especially the concept that they can "create" these effects according to different melodies or accompaniment patterns. Therefore, it can be said that jazz is jointly created by composers and musicians because of the tradition of improvisation and the exertion of personal skills. It is difficult for musicians with traditional education to play jazz because they have not cultivated such a special musical concept. If we carefully compare the difference between real folk singers and formally trained singers singing the same folk song, we will have a more intuitive concept of this meaning.