how does music speak to our souls?

 Something that interests me is wondering how music evokes certain emotions within people. Take an upbeat Journey song, for instance. Many will equate the song with being a cheerful song. Of course, many will find it to be dismal and dreary. Regardless of whether or not a person may enjoy the song as likeable, they may still find it to be a mix of sounds with the goal of being cheery. No two people will hear a song the same or have the same emotional reactions, but what i'm wondering is how would so many universally identify the song as happy sounds? Maybe the romantic notions of the song would not be so happy to some, but the guitars and drums may present the song as exhilarating n exciting to a large amount of people. If a few hundred were asked their opinion of the uppy song, many would agree it makes them feel good, the band wanting to express and elicit from others this type of mood. Many would horribly criticize, of course. How did the tune of this song cause happiness within so many, the band wanting to produce this within people? 

Take a song composed entirely of drumming. The song would make many want to get up and move. An array of emotional responses would ensue. Things that are completely and possibly unexplainable are how people get the idea to produce a song and how people react to the sounds they hear. Who was the first person on Earth to decide he or she should make some sort of compilation of sounds? When did anyone decide this was any source of enjoyment? God gave people this creative pastime. When did this come to be, and how? Music reflects emotions. Sound structures somehow communicate feelings, and this is something that baffles me. Speech, gestures, and other forms of person-to-person communication are already of much confusion. Expressing thoughts in the form of tunes seems much more beyond comprehension. It has been researched that plants also respond to music. Singing to plants and pleasant music has been said to help them grow. Certain music, such as metal, has shown to be detrimental to their growth. Of course, noone knows how plants register sound, if they hear the actual music, if they feel it in vibrations.

An album of relaxing music, designated for this purpose, may calm some and be a clashing cacophony for others. How is it that many collectively relax by these specific variations? How does music speak to our souls? This is something completely elusive to me.