system
Given the following post, respond as if you're commenting on Reddit:
human
Why do certain sounds sound appealing and others don't?
gpt
Three incomplete explanations:

1. A sound can be appealing because it is associated with a pleasant experience. If you grew up near the ocean, for example, a distant foghorn might be a pleasant sound.

2. As for the quality of sound, it might be that we are born appreciating certain sounds that are associated with well-being or survival, such as kind human voices or trickling water. Both could indicate safety and security.

3. In music, we tend to appreciate certain harmonies. These tend to feature a moderate amount of dissonance. Two tones played in unison (both the same tone) sounds nice but is uninteresting, as the frequencies (as measured in Hertz) have a simple 1:1 ratio. An octave has a 1:2 ratio and sound a little more colorful. Other harmonies have more complex ratios like 2:3, 3:5, etc. These are more colorful still. As the ratios get more complex they start to sound sad, and then eventually hideous. The most complex ratio within an octave on a piano keyboard is 45:32, known as a tritone. It sounds very "ugly". To hear a tritone, play the notes C and F# simultaneously.