'Atmospheres & Backgrounds' is a collection of moods ranging from unsettling to euphoric with every shade in between. Quality is fantastic as is the variety: not only a spectrum of emotion but also textures and brightness. The 'Atmospheres' folder has the longer files which evolve just the right degree and the 'Fragments' folder is full of bits perfect for looping / getting creative with. If you're looking for musical (and key-noted) ambience 'Atmospheres & Backgrounds' is one of the best packs I've found yet.