The Ambient Environments soundscapes are quality recordings that combine sound and music into an audio atmosphere for your storytelling games. Each track is ten minutes long, with no fade in/out at the start or end, making them perfect for continuous looping. While reviewing this series, I played each track in the background and often didn't notice when it had started over. The sound levels are
compressed very well, which means that there will be very few distracting volume changes when you play these during a session. And at $1.99, the price is very reasonable.
The At the Mountains of Madness soundscape includes arctic wind, along with some spooky ambient music (some of it kind of backwards sounding, for greater effect). A very good mix of sound effects and evocative music. All of their soundscapes are very good, but this one actually made me start thinking about running something that I could use it in.