Acid jazz is a type of jazz that combines elements of soul, funk, and hip-hop. It was popularized in the 1980s and 1990s. Traditional jazz is a style of jazz that originated in New Orleans in the early 20th century. It is characterized by collective improvisation and a strong rhythm section. BEBOP is a style of jazz that emerged in the 1940s. It is characterized by fast tempos, complex harmonic structures, and improvisation based on harmonic structure. SCAT singing is a vocal improvisation technique in which a singer vocally imitates instruments. Modal jazz is a style of jazz that developed in the late 1950s and early 1960s. It is characterized by modal scales and improvisation based on modes rather than chords.