I use these sound tracks to help me sleep, relax, focus for writing, stay alert when fatigued, and more. I have tried many other nature sound machines and CD's through the years, but this is by far the best. The catalog gives accurate information for recommended use of the tracks. Even my cat has favorites ("Zen wind and water" & "Sedona Canyon") to chill-out with. "Solitude Canyon" is my go to app for shutting out distractions in my writing environment. I also use the tracks as a prelude to meditation. If I find myself in an obsessive thought track, listening to one of these helps clear my mind for meditation.