It’s increased by one minute in 60 years. I don’t call that drastic. That being said I imagine if you went back to before the 50s song lengths are even longer given the popularity of big band music and jazz. As to why, I would say it’s a combination of music genres that are popular and technology/modes of consumption.
To me it’s like asking why there are more parts in a car now than there were in the 60s.
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