Hi,
There is no chance, that anyone is not going to say that something comes from something else, and is now considered a rip off. With music recorded and records kept for the last 100 years, we will find even more stuff that is the same.
Pretty soon, even Tangerine Dream ripped off Bach, since the same "notes" were played, but the accents and effects were so heavy going around, that no one could even conceive of that idea or concept.
It's not about the stealing of the notes ... since we were all born with them around us ... it's about the music ... and since we're only concerned with one bit ... I guess that everyone rips off everybody! Cue the guitar, and the vocals ... here comes the bridge and then the solo! Wanna talk about even more rip-offs? How about the constant copy of the song format!
That's even more tiring than the same chord progression or set of notes!