Early Jazz is a genre of music that developed in the early 20th century. It is characterized by improvisation, syncopated rhythms, and a strong swing feel. BOP, or bebop, is a style of jazz that emerged in the 1940s and is characterized by fast tempos, complex harmonic structures, and improvisation. JIVE is a style of swing dance that was popularized in the 1930s and 1940s and is characterized by its energetic movements and upbeat music.