lately I have had problems with samsung music because a specific artist, even if I modify it, comes out the same I already deleted the data from the app and downloaded the artist's songs again and I still have the same problem.
modifying it how? what's the same and what are you trying to change? I had all my music on my computer. modified titles, albums, artist and then to my phone. everything came out right. Copy to computer, highlight the song. Right click, select properties, click ok. then go to the next song. When done copy everything back to your phone.