Just a suggestion - Stop worrying about "subconscious plagiarism." It doesn't happen as often as one might think, and even if it DOES happen, there is no consequence to it unless you write something that makes money. Even then, the only consequence is that you have to SHARE the money.
Not worth worrying about really. And the 2nd BEST thing that could possibly happen to you as a songwriter is that you write something that infringes on somebody big, and what you do is so good that they feel compelled to order you to stop. (The best thing would be that they steal YOUR song btw, and you have to sue them to "cease and desist".)
In either scenario, you simply can't buy publicity like THAT.
Again.... not worth worrying about.