oh boy, this is a hot mess. i spent hours upon hours of re tagging 1000's of songs, by artist, title, and or album art. only to find out that when i got my 920 back it was all jacked up again. it took me awhile to realize that it was xbox music cloud which was the problem. in the upper left hand corner of the xbox music app on my pc, i noticed i could view my music from this pc, or my music from the cloud. and the incorrect tags were all in the cloud. everything on the pc was fine... so i searched and searched for a way to edit music in the cloud, only to find out you cant. the solution was to back up all music on an external HD, delete all music from pc, delete all music from cloud, then re-add music to pc from the back up. however, even after doing that, there were still incorrect tags. moral of the story? xbox music cloud service is awful and worthless... i hope and pray its fixed in 8.1, in the meantime i am using nokia music and it works beautifully. one other note, i have xbox cloud collection off, to avoid the incorrect tags. and i have connect with xbox on, and i dont have any issues with incorrect tags now. but i dont get the album art in the background unless its a purchase from xbox... none of the music i've purchased from itunes, google, or amazon will pan album art in the background... hmm???