Writing a novel based on a song without the singer's consent, but the novel had already spread on the Internet, was that considered copyright violation?

Writing a novel based on a song without the singer's consent, but the novel spread on the Internet, was that considered copyright violation? In this case, if the novel was based on this song, it could be said to be an copyright violation. This was because the copyright of the song usually belonged to the singer or the record company, not the song itself. Therefore, if the song was adapted without authorization, created into other forms of works such as novels, movies, TV series, etc., and spread on the Internet, it might constitute copyright. Of course, the specific situation still needed to be analyzed. If the plot, character setting, scene description, and other parts of the novel were similar or related to the content of the song, there might be an act of copyright violation. In addition, if the storyline, character setting, scene description, etc. of the novel did not directly quote the content of the song, but were creative re-creations in other aspects, it might not constitute an copyright violation. In order to avoid any acts of copyright violation, it is recommended to strictly abide by the relevant laws, regulations, and ethics when creating and distributing works. Respect the original work and avoid the unauthorized use of other people's creativity and content.