Music tags trouble

I recently bought a bigger SD card for my Instinct so I could put all my music on it but I seem to be having trouble getting it to Identify and organize all my music. All of my music is in .m4a format (iTunes aac) and has MP4 tags that are correct.

However only 2/3 or less of my music is listed with an artist or album. I did much experimenting with adding or taking away parts of the tags on certain files to see if the phone would read them correctly but I've had no luck. Has anyone else had this problem or found a solution?

short answer...the music players. id3 tagging reader is terrible.....im not sure which part of the ID3 tag you have to edit to get it to read properly. hope you are able to experiment to get it correct.
Dale