I hope this set only features music by McCarthy and Chattaway. David Bell always reused his own material and If you look up the term sonic wallpaper in the dictionary you'll find a picture of Paul Baillargeon.
Well, I could defend Bell and Baillargeon, but that's a matter of opinion. So I'll just point out that there were a few other composers for DS9. John Debney did "The Nagus" and "Progress," Richard Bellis did "The House of Quark," and Gregory Smith did "The Assignment," "Honor Among Thieves," and "Field of Fire." Although Debney is the only one of those whose work I remember as distinctive.