What has led the segmentation of rock into sub-genres since the 1960s?

I think the idea of sub-genres in rock comes from the person who sang it and then messed with the beat to form a new song. The different genres such as Gospel, Blues and Bluegrass all come from other musical backgrounds. Gospel comes from white and black church hymns, Blues comes from old slave from the South that have specific chords and Bluegrass has a background from the South and Irish and Scottish instruments. The hybrids of the songs, which take traditional music and change it into something new is how many different genres got started. Take Elvis’s “Hound Dog” as an example, which was originally by Big Mama Thornton, he used more Rock instruments rather then Blues.

Then R&B came around with people like Ray Charles introducing a new sound made up from Blues and Gospel songs. Even the Rolling Stones began playing music, which was considered the Blues. Then even Rock began to have different genres like Top 40, heavy metal, and punk rock. People who were once classified as Rock like Pink Floyd, Bob Dylan and the Beatles wanted to expand their music, making it matter of what they were singing about therefore making their own set of music. These different artists along with Led Zeppelin, Michael Jackson and Chuck Berry expanded the different Rock genres we have today. Because of those people and groups we now have music like alternative, techno and rap. Many of the new genres we have now are from people rebelling and telling the world how it is, which thankfully has paved the wave for plenty of new and amazing artists.