I would naively assume that both Spotify and Tidal pull that information from the same sources. Hopefully there is a web service. Not to take anything away from the first person who decided to, you know, actually tell us this information. At this point it should be table stakes for a music streaming service-indeed, it should be a legal requirement if you ask me.
Thanks, that's really surprising. Credits get into ownership and payment, and I assumed some group of authorities would have that on lock, and would have pooled all their data since it's sort of in their interest to do so. Silly me I guess!
Spotify just pays the owner of the song (typically a record label) so doesn't need to be concerned with who created it. But yeah, even then, it's surprising the Spotify credits are so poor. Everyone forgets about Ringo!