As music lovers, we would have noticed that any kind of music pretty much revolves around a set of fixed themes. Many of the themes include but not limited to happiness, sadness, melancholy, romance, lust, depression, loneliness, inspirational, propaganda and so on. Broadly speaking, the themes talk a lot about human states of mind a.k.a. humanity. So, why do these themes keep repeating in most of the songs? Here's a possible reason.
The humanities and social sciences deal particularly with the study of human psyche. Unlike science and technology, our psyches don't dramatically evolve every day. We pretty much feed our souls with the same truths again and again. Since music is a field of study in the humanities area, this aspect of repeating themes is quite evident irrespective of the genre. 
Therefore, even though the deliverance of music has changed and evolved with the help of technology the content has not changed much.

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