There are different kinds of music, each kind appealing to certain souls according to their evolution. For instance, children in the street are very pleased when beating the time, because that rhythm has a certain effect upon them. But as a person evolves, so he longs for a finer harmony. Why people like or dislike each other is owing to their different stages of evolution. For instance, one person is at a stage where he appreciates a certain kind of music, another one, whose evolution is greater, wants music appropriate to his evolution.