【作業用BGM・勉強用BGM】滝と小鳥のさえずり3時間版

【作業用BGM・勉強用BGMまとめ】 癒し系作業用BGM：滝180分(比翼の滝) Please use for daily healing which got tired and more. Moreover, since it is said that such a natural environmental sound has an effect which heightens concentration, an effect is demonstrated [ under study or ] to concentrate. Virtual trip to the healing nature world. Nature Sound for reading,working,healing,relaxing,chill out,yoga,sleep,study and more. BGM for work,study,reading,stress alleviation,concentration, m