Movement 4 is a trombone feature and represents the Southwest. The Southwestern flavor is accomplished through alternating 6/8 and 3/4 and the bright colors of the muted brass playing staccato eighth note rhythms and "ay" sounding motifs. The tonality and melody are also very traditional and once again I was looking for ways to spice it up a little without destroying the folk nature of the movement. I varied the meter by changing to 4/4 or 5/4 where one expects to hear 3/4. I inserted some chromaticism to add variety to the melody. I even slightly changed the melody when it repeats for some variety and use contrapuntal lines often. Another technique I used was a canon at measure 30. I also used an augmented triad as a substitute for a V7 in some places.
The form of this movement is like a verse-chorus. I think of the 3/4, 6/8 alternation as the verse and the straight 3/4 as the chorus. The chorus contains the more attractive melody and I use that more often than the verse.
To see and hear what I have discussed, go to http://www.cooppress.net/american_vignettes_blog.html. You will be viewing a transposed score.
As always, your comments are appreciated.