Final answer:
Cool Jazz is the style that emphasizes lyricism, lower registers, moderate tempos, and quieter dynamics, emerging in the late 1940s and reflecting a smoother, more reflective approach to jazz.
Step-by-step explanation:
The jazz style that emphasizes lyricism, lower instrumental registers, moderate tempos, and quieter dynamic levels is known as Cool Jazz. This style emerged in the late 1940s and early 1950s, serving as a counterpoint to the fast-paced and often frantic tempos of Bebop jazz. Cool Jazz, associated with artists like Miles Davis and Chet Baker, became synonymous with a smoother, more reflective style of playing, focusing on melodic development and often using arrangements that highlighted the interplay between individual musicians and the ensemble.