[onpensionsterm]

If you accidentally recite someone else's work, it's still plagiarism.

[UncleMeat]

I am absolutely certain that I have written sentences that are word-for-word identical to sentences other people have written. Should I be sued?

[onpensionsterm]

You're describing something that happens regularly. Especially in music.

[UncleMeat]

That's the point.

Accidentally including the same material in something new is not immediately infringement.