I have a question: Is it possible (and how) to add (feat. artist) to the title if the artist whose name is to be in brackets is to be the second primary artist? (in spotify)
For now, I only have a music file without any metadata (sorry, I'm new to this) I would like Artist2 to be included in the title as a guest, but to be listed as the primary artist in the song specification (on spotify)
Your musicfile has no filename?
If you load your music file into Mp3tag and then press Alt+T to show the Extended Tags, do you see only a completely empty popup window?
I think the whole process is controlled by Spotify. If you're an artist, I think you can edit your release metadata via your Spotify for Artists page (I haven't tried this and seen such a page personally!).
There, according to the music metadata guidelines, you can specify different roles for artists, e.g., main artists, featured artists, remixers, composers, lyricists, and producers.
Have you tried to fill in some tags and then see what spotify makes of it?
If spotify does not care, you would have to ask their support on what to do.
MP3tag is a program for actual tagging but does not deal with the philosophy of metadata in files.
If you know what should be done with your files then MP3tag can help you in many cases.
Exactly.
You have to ask the Spotify people what they need. If that is metadata in tags, then MP3tag can help you to add this data.
But all the questions about rules and requirements to publish tracks with the help of a certain distributor has to be asked in their support.
I would have expected that by now you would have followed the link from @Florian 's post:
and that would have answered most of your questions.