What ID tag reads the default multimedia application of N900?

I ask this because I carefully renamed all songs in my db, some of them cleared all tags before editing again but the N900 still showing me some music with different tag data??

I'm editing files with EasyTag under Ubuntu but tried other software and the result still the same.

Sorry for disturbing you but even if I posted after some days digging into this problem appears wasn't enought as I finally found the solution and here it is for people encountering my same problem:

Some tag editors just edits last version of ID3 that appears if you had ID3V2.3.0 already set they doesn't replace it neither when you clean up all tags and N900 is looking for first valid ID3V2 datas.

To be more precise I had ID3V2.4.0 data updated while ID3V2.3.0 were old and what N900 was reading!