Intros are often musical and are generally at the beginning of the song. Listen to a lot of standards and you’ll hear they usually start with a musical introduction that sometimes contain elements of the melody that is about to be introduced.

Reusing elements

Jazz standards sometimes re-use elements of their introduction as an outro to end the song. You might even hear cross-song references. People like Oscar Peterson have been known to play piano licks that will remind you of other famous songs and even contain elements of children’s songs!

Melodies

After the introduction (if there is one), the melody of the song is usually played. If no singer melody often played by another instruments like a piano, the horns or a guitar. Obviously this depends on who is playing in the band! While the melody is being played, the other band members often support it with things like chords. This is usually with instruments that can play chords like a guitar, piano or both. One of these instruments plays the chords to the song with the melody.

Solos

After the melody / melodies have been played, the improvised solos usually begin! Improvisation is what Jazz is all about for many Jazz pianists and musicians, and there’s lots to learn! Despite having stopped playing the melody, the musicians are still playing the same song. The chords are still going on, but a pianist can now their own melodies on the chords of the song!
http://www.jazzonpiano.com/2010/04/typical-jazz-song-structure/

                                   


                                  Coming Through Slaughter Chapter 1 Structure

4 parts like a Jazz Song.

Introduction: Bolden's Biography. The description of his background.

Melodies: Crowley and Nora's narration. The Present of what is happening to them.

Solo: Bolden's present, what is happening to him.

Reusing Elements:  Coming back to descriptions of his background. Comments of others about Bolden.