Some songs not appearing in list?

For some reason some of the albums I’ve put on my expansion card aren’t appearing in the Albums list on the player.  They are showing up in the Songs list but I want to have them in the Album list for easy accessability.  Is there some specific tag format it needs to sort them better?

Sansa players are most compatible with ID3v2.3 ISO 8859-1 (Latin) tags.

If the tags are incomplete/missing, items will be listed under the “Unknown” category. Have you checked the Albums list for such entries?