MP3tag is a great app for fixing ID tags on audio files. You can pull info from online databases, add album art, add tags based on file names, or rename files based on tags. https://www.mp3tag.de/en/
To everyone ready with their pitchforks, here is a scenario: lemmy.world may receive a court order (subpoena?) mandating they disclose data on people actively accessing pirate communities. As it happened with Reddit, they may ask for logs and IP addresses of people commenting, posting or perhaps even up/down voting content.
Even though none of the content is being posted/hosted with this instance, admins may be asked to betray user trust - or to go battle claimants in court. It’s a lose-lose for them, so maybe let’s cut them some slack, eh?
Nyaa is great, especially if you want full volumes. For weekly chapters you may also want to check https://w15.mangafreak.net