Not such if this is a bug or a "feature". Now we have huge album art in iTunes, I noticed that lots of my albums are showing low-res jagged images, like this: To fix it, I selected all the tracks, got info, deleted the artwork, and manually added a high-res image: A few minutes later, I switched back into my iTunes window, and saw that the album art was once again the original, low-res, jagged image. I repeated the above, but the same thing happened. To test it, I went in and deleted the artwork. The album updated to show: I left it... and a few minutes later, switched back in, and saw that iTunes had auto-updated the artwork to the same crappy old low-res version. So, clearly it is auto-updating from Apple Music (I'm not a subscriber, but I do have iTunes Match), overwriting whatever you put into the artwork Info tab yourself. I can't find any setting which controls this, so I assume it's yet another bug? Looking through my library, I have tonnes of albums with crappy low-res album art. Anyone else replicate this?