Is it possible that a song is similar to the previous one without the author's knowledge?

Yes, because the creation of this kind of thing comes from a person's inspiration, and this inspiration comes from life, from what the author has encountered and his state of mind, so if two authors have encountered the same thing, something similar may appear, but it is also because two people have the same * * * voice about the same thing, which cannot be said to be plagiarism or plagiarism, although if published, it may make others. However, ordinary people will find it difficult to distinguish the authenticity of plagiarism, and many people will not believe that there is such a coincidence in the world, and then it happens to these two people so coincidentally, so this is a place that is prone to misunderstanding.

Don't say that the creation of a song is like a poem. Helen Keller once encountered this kind of thing, but everyone she used to believe in thought that she copied a poem by another famous writer, but Helen really wrote that poem without knowing it, but many people misunderstood her as a person who could do nothing and then wanted to be famous.

In this case, it is hard to say clearly, but there is no way, because the author did not plagiarize, but there is no real evidence to prove his innocence, and it is easy to be detained as a so-called dirty person who does not respect other people's labor achievements and steals other people's intellectual property rights. So this also tells us that when publishing new works, we should check whether there are similarities, otherwise there will be big problems.