Which musical style introduced group improvisation?
a. new orleans jazz
b. free jazz
c. baroque
d. bebop

   A. New Orleans jazz

Explanation:  New Orleans is considered a cradle of jazz, and its earliest form is dixieland also known as traditional jazz.  It emerged from the need for entertainment and dancing, this kind of jazz has several characteristics such as a frontal line that gives a melody and often deals with improvisation and polyphony. This line can consist of a trumpet or a similar instrument. Also, characteristic of this jazz is a rhythm line, usually a drum and/or piano.

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