Evolution of appreciation for music

How did appreciation for music evolved in humans? How do we go about studying this?

How do we know humans are the only animals cabable of making music or appreciating it? Specifically, I'm thinking about whales who emit low frequency sounds that we can not hear.

It is my hypothesis that all tissues rely on DHEA for optimal function. Many different phenomena may trigger DHEA release. Music may do just that. It has been found that "group drumming music therapy" increases DHEA: "Group drumming resulted in increased dehydroepiandrosterone-to-cortisol ratios, increased natural killer cell activity, and increased lymphokine-activated killer cell activity without alteration in plasma interleukin 2 or interferon-gamma, or in the Beck Anxiety Inventory and the Beck Depression Inventory II." (Altern Ther Health Med. 2001 Jan;7(1):38-47). Perhaps "music appreciation" is our behavioral response to increases in DHEA caused by music.

It is said that music calms the savage beast... We can understand this by looking at the living system... All living beings have rhythms that are essential for a stable life... Every organism is continually struggling to adjust to its environment and not a single one of us can say that we are completely settled in life and have no worries... Our cell divisions, our breathing, our heart beats, even the electrical impulses in our brain follow a rhythmic pattern... If any of those patterns goes out of frequency then we notice it and might face problems... Music is a form of rhythm that helps the body to feel at ease... Our bodies generally tend to adjust to the frequency of the music we listen to and that is what makes different people listen to different types of music... It all depends on the actual frequencies of our bodies... There was a test conducted on growth of plants, placing them in sound proof chambers and keeping a player inside each chamber, each player giving music of a different type (like rock, jazz, classical, etc) and the one that had classical instrumental music inside grew the best when compared with a control plant... I hope this answers your doubt...