At one time, composers and producers were not nearly as obsessed with copyright as we are now. Heck, orchestral music has places having whole lines copied and thought of as paying tribute -- sometimes twice or three times in a symphony.
A lot of water under the bridge between then and now. I've heard of suits where the plaintiff's case was based on "sounds too much like." The upside of that is most of the songs heard on the radio today, we don't even want to sound like.


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