First of all, it is certain that you can sue, because copyright, that is, copyright, is naturally formed with the birth of your intellectual achievements (this is the case in most countries, including our country) - unlike patents, it is not based on Registration is a requirement. The key questions now should be the following two-whether you want to sue and whether you can win.
Let’s first talk about whether we want to sue. It depends on your starting point: 1. Fame and profit, that is, copyright and income rights; 2. Out of righteous indignation, you feel that you need to personally fight for the dignity of the law and the interests of your colleagues. If it's 1, you can talk to the other party privately to try to win without a fight. If it's 2, you can talk to a lawyer right away.
Let’s talk about whether we can win. It also depends on two points: 1. Do you have evidence that the other party plagiarized your lyrics? 2. Whether you can hire a good enough lawyer. If you have no clue on the first point, there is basically no need to fight. If the gap is too big on the second point, it will be embarrassing. Of course, if your starting point for filing a lawsuit is the second point in the previous paragraph, that is, righteous indignation, then please be my This sentence was not said.
PS: Not to encourage you, but I really think the second starting point is more awe-inspiring.
That's all, please adopt