Sounds of music cannot be found in nature, yet we all know some songs that "sound like a sunny day". Music can remind us of natural sounds that we hear and can stimulate some familiar emotions that these natural sounds make us feel.

Music with uniform rhythm can create a comforting sense of familiarity by periodic repetition. A great example is Bach's Suite for Orchestra No. 3 in D Major, BWV 1068: "Air". One of the most relaxing pieces of music ever created, it has ingenious harmony and melody, but uses a simple uniform 2/4 rhythm. Uniform rhythm also makes music easier to follow while dancing. For example ballroom Waltz dancing involves a uniform 3/4 rhythm.

Interestingly, the most relaxing sounds in nature do not exhibit a uniform rhythm. They are not repetitive, bur rather "quasi periodic" - close to being repetitive. The best example is ocean waves breaking on the shore. Ocean waves will come in slightly different times, exhibiting a pattern of "missing a beat" or an occasional "early beat".

Other good examples are soft wind, and singing birds. Interesting examples of music that uses similar quasi periodic rhythmical patterns are modern Jazz music, Greek music, and Middle Eastern music, where the rhythm may change non-uniformly from 4/4, 2/4 and 3/4 to 7/8 (missing a beat) and 5/4 (lingering on a beat). Calm human speech, the sound of a mother talking softly to her baby, is also quasi periodic.