Nature's Symphony contains 24 of nature's musical instruments to mix and match into the soothing symphony of your choice. Sounds include: waves, winds, waterfalls, rain, thunder, hail, birds, cricket chirps, wind chimes, loon calls, a purring cat, a roaring fire and a chorus of frogs. Since all 24 high-quality, stereo sounds can be played together, there are millions* of combinations to explore. The colour-coded interface can be rearranged to put the sounds that you enjoy most near the top, where they're easiest to find.
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*Fun Fact: combinations are maximized when you play 12 of the 24 sounds. In this case there are 2,704,156 possible ways to mix and match. If you listen to each combination for 10 minutes then you'll need about 51 years to hear them all. Start mixing! The table below shows all the possible combinations for the number of sounds playing.

Sounds playing Combinations
1 24
2 276
3 2,024
4 10,626
5 42,504
6 134,596
7 346,104
8 735,471
9 1,307,504
10 1,961,256
11 2,496,144
12 2,704,156
13 2,496,144
14 1,961,256
15 1,307,504
16 735,471
17 346,104
18 134,596
19 42,504
20 10,626
21 2,024
22 276
23 24
24 1