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Put simply, this app is all about zen and relaxation. It's filled with samples of everything from waterfalls to wood flutes, thunder to rain, the ocean to tribal drums, and far more. You can enable/disable whichever sounds you like by touching the respectively-labeled wood signs, or you can play preselected arrangements and worry not about fidgeting with creating your own soundscapes.
As a musician, this app allows me to relieve stress not only by its relaxing sounds, but by enjoyably piecing together my own soundscapes. You don't have to be a musician to love this simplistic and relaxing app, though!
App Store Link 1: Relax Melodies Premium HD ($3.99 + optional in-app purchases)
App Store Link 2: Relax Melodies HD (Free reduced content, ad-supported version)