2. which musical style is defined by a constant groove, fractured bass lines, and a busy horn section?

"The musical style in which the constant groove, fractured bass lines , and a busy horn section is defined as the jazz and blue genre of music."

Explanation:

In the constant groove the structure of the music includes the sense of propulsive rhythmic sense, as they are rhythmic patterns of "swing"or "feel".As they are featured in the jazz genre of music.

The fractured bass line is featured by the jazz and blue genre of music.

It is sorted by the section of the music team in which there is contribution from the artists or the group of musicians who plays horns of different types. Mainly the horns includes the "Orchestra", as it refer to the group of musicians who are involved in playing the "french horns". As the add value the artistic work and makes the music more amazing to listen to.