So how did you do it? I want to write backgrounds in the same style as the song.
So Sundance already nailed it in her post above withe respect to the horn selection and arrangement aspect, as you can see in the attached screenshot, many of the horn sections have the option of generating the instruments on a track-by-track basis. Also note that you should experiment with mixing various combinations of "background" and "soloist" type tracks for added flavor.
Finally, I find that you can generate very interesting arrangements using the process I described that I'll copy and paste from what I wrote with respect to the my track Labor Day: Old Friends Passed.
Interestingly enough, it's basically just a series of ascending then descending major and minor thirds (and a couple of fourths thrown in) with a high-E note pedaled throughout.
I originally came up with the underlying melody while messing around aimlessly on my battered nylon string guitar, and was enamored by the voicings that resulted from the juxtaposition of some simple thirds and fourths over that same E note.
Back in 2010 or so, I had transcribed the tablature into Guitar Pro 6, rendered it into MIDI, and then imported it into BiaB using an old school MIDI style in order to make backing tracks that I utilized to give a few guitar lessons. .
After acquiring the Xtra Styles PAK 5, on a lark, I re-imported that nearly forgotten sequence, (originally written in 3/4!), into BiaB, and loaded the CRONGA+.STY style, and the result just blew me away. It was nothing like what I heard when playing the pre-packaged BiaB style demo (which is excellent in its own right). But this YEARNED.
