Over the years as I've composed some songs, I can't help sometimes noticing that some of them resemble some melody I've heard somewhere. I also kept thinking about a great melody which my friend suggested that I'd work out and record, if I haven't heard it somewhere before. I know Google's search bar can recognize recordings and name them, but I don't think there's any way to identify a melody as such to avoid subconscious plagiarism, not that I can think of. Any ideas?