Album Artist
Album Artist is a very important TAG for music as it allows you to group compilation album tracks together, whilst stil having the correct Track Artist associated with them. I use this field to manage my music in Windows Media Player and Zune.
Also Why does teh Disc Number column not list the disc number when I have synchronised Nokia Music to my iTunes folders and the disc number is set for all my albums in iTunes whereas Nokia Music leaves teh column empty. When I copy the files from my iTunes folder structure to my Zune folder structure the Disc Number disclays in the Zune software.