I THINK when I first came up with it, it was the result of jamming on a 12 string with a scale I had just learned. I'm pretty sure it started as a collection of three or four riffs, organized as an intro, verse, chorus, and bridge. The verse came first (if that makes any difference

The guitar version was cool, and I liked it, but for some reason or another, I then opened up Finale and orchestrated it for a wind ensemble.
In summary, the phrases were created on guitar, and then orchestrated for other things in Finale. The bulk of it was in real life, but the specifics and the little embellishments (woodwind glissandos! Heck yeah!) were done on my computer. I'll probably try and repeat this process in the future, because it worked once, and it'll probably work again.