No, this post is NOT designed to stir up debate about what is or is not "plagiarism". No legalities need apply here, I'm just talking about examples you heard in your head. Here's an example: Back in late 1982, when the Stray Cats released their hit song "Stray Cat Strut", I remember thinking that it was very similar to the Richard Hell punk anthem "Blank Generation" that had come out a few years earlier, and for decades whenever I heard SCS i would think to myself "nice lift, fellas". But just a few years ago, I found out that "Blank Generation" itself was largely a re-write of a 1959 song called "Beat Generation", so the trail of influence actually went back way further than i imagined. Maybe it goes back further still!