It seems to me that the GUS's SBOS software is not well documented these days. For instance, if you search for recordings of music played by SBOS you will not find any!

So here I am to remedy this with an hour long chunk of SBOS music from many popular games (Wolf 3d, Keen, Blake Stone, Jill, Major Stryker, etc.)

https://www.youtube.com/watch?v=JboCNzrYQvs

There were many different versions of SBOS, some of which were designed for specific cards (SBOS 3.82 and earlier for GF1 chipset Gus cards including GUS Max, MAXSBOS a special version of SBOS for Gus MAX, IWSBOS for GUS PNP with the interwave chipset) and they all sound very different from each other. In this case I used SBOS version 3.82 with a GUS Max.