I once read a book that talked about a man's experience in the afterlife while he was in a coma. Whether or not you believe such things are possible, I think something he described has a lot to do with music and art. He talked about what happens when people embrace there. He described it as being one of his favorite parts of his experience.
People did not say "Hi" or shake hands, they embraced and it was like you gave "a feeling and synopsis of your life to one another. Suddenly you [knew] and [understood] a person in ways far beyond any verbal communication. It [created] an instant bond . . . [that built] a foundation for loving one another more perfectly." (from The Message by Lance Richardson)
I think that music and other forms of art can give us a similar experience here - especially music. Leo Tolstoy says in What is Art that true art is "a means of union among men, joining them together in the same feelings, and indispensable for the life and progress towards well-being of individuals." I'd recommend reading all that is found at the previous link (or the whole book - which is what I'm working on currently).
There is a reason that music has been called the "universal language." It has the ability to communicate in a way that language cannot. But why doesn't it do that every time? Why do I come away disappointed from some concerts that are performed perfectly and yet come away "fed" and inspired by other musicians that may have been technically accurate or not? Why can some performances communicate to me and join an audience together and others not? I think these are very important questions.