How such a fast shift?

It's funny when you look back at the music leading up to the 60s. Not every single song/musician of course, but a majority of songs in the 50s and early 60s had very simple lyrics. Think of the songs that were big; songs about dancing (The Twist), repetitive surfer lyrics (Beach Boys), simple love songs (The Dixie Cups). I am not saying these songs are bad, because they are actually quite fun to listen to, but the lyrics don't really have much depth. How was there such a fast shift from finding these songs great, to finding songs with more abstract lyrics so phenomenal? There are songs in the 60s that have crazy, yet amazing lyrics. Even when you think about some of the Beatles' songs you see this. Mostly though, Bob Dylan was the biggest change. He said he was a poet first, and it definitely showed in his lyrics. Sill known to be the one of the greatest songwriters,, he surely proved that he had a lot of important things to say. It's shocking that a world can go from liking simple melodies and lyrics, to liking a man with just a guitar and a lot of great words. During this era, a lot was happening in the world, and people were trying to make many changes. So, what I always wonder is, does music and change go hand in hand? It's clear that there is a definite strong correlation between music and movement in the 60s. Music had one of the biggest impacts on the people. Do you think the generation in America started to change and think more because of the more thought provoking lyrics, or do you think the people started to change, and so they wanted to hear more thought provoking lyrics? I could never see a generation switching so fast from what they found appealing musically, so I just really wonder if what was going on in the world around them such as the civil right movements, and the Vietnam War affected their new found taste in music.