I use this app often throughout my busy day -- while I work at home, at our retail space, at the yoga studio where I teach, and finally, to help me drift off into sleep. I have my favorites, but I enjoy them all. Great sound quality. I have fooled my yoga students into thinking it was beginning to rain, or that we were getting a larger than usual flock of birds outside. I like that they loop at long intervals so that you don't recognize a pattern. Highly recommended for all occasions but especially for chilling out while studying, working or simply relaxing with a book at the end of the day.