Google Music showing pixelated or wrong album art on phone

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http://forums.androidcentral.com – So I've been transferring all of the music from iTunes library on my Macbook to Google Music on my phone (a rooted T-Mobile Samsung Galaxy S II running CM10) by using the phone as a USB mass storage device and just dropping the mp3 files into the phone's "media" folder. When I use Google Music, I can see that all of the files are there and I can listen to them all. However, my problem is that, on my phone, Google Music either: A) displays pixelated album art that has a lot of ugly compression artifacts (all of my album art, with each image being at least 600 x 600 px, has been (HowTos)