Retagging collection, need some advice.., DISCNUMBER, ALBUMARTIST, etc.. Options

[BelleAndZEK]

So I finally decided to retag my FLAC library because I want to get rid of the mp3 transcodes and only use FLAC instead. Will do with XBMC.
Now before I start, I'd like some advice on a few things..
EVERYTHING is tagged the same way right now:
- ARTIST
- TITLE
- TRACKNUMBER
- ALBUM
- DATE
- ENSEMBLE (for Album Artist, Tag&Rename used that.)

Here's what I'm going to do, what I want to do:
- Remove the ENSEMBLE tag and use ALBUMARTIST instead
- Use TOTALTRACKS
- Use TOTALDISCS
- Use DISCNUMBER

Now I'm wondering what's best.. Should I use a leading 0 for TOTALTRACKS, TOTALDISCS and DISCNUMBER or not?
For albums that have only 1 disc, should I use the TOTALDISCS tag or leave it blank? Same for DISCNUMBER..

For multi-disc albums, TOTALTRACKS is for each disc or the total of all discs? I'm guessing it's per disc...

Also, let say I have an album called 'Hello' and a CD-Single also called 'Hello' by the same artist. What's the best way to get the tracks of both releases not mixed together if I want ALBUM to just be "Hello" and not "Hello (CDS)" for CD-Single for instance? Is there a 'CDS' 'EP' 'Album' tag that most softwares recognize for that?

For albums with a bonus disc, is there a field I should be using for the name of the bonus disc? A field where I can add 'Live in ...' for the bonus disc for instance..

Any other tags I should take in consideration apart from GENRE? That one's too subjective.

I have thousands of albums to do, I just want to make sure I get things right before I start. Thanks!

This post has been edited by BelleAndZEK: Jun 4 2012, 21:15

[skamp]

Xiph.org proposes TRACKTOTAL and DISCTOTAL, not TOTALTRACKS and TOTALDISCS. No leading 0 required (or even desired).
VERSION can also be of use, when you can get your player to display it.

[db1989]

Xiph.org proposes TRACKTOTAL and DISCTOTAL, not TOTALTRACKS and TOTALDISCS.

Yes, and foobar2000 since v1.1.8 beta has adopted the recommended field names, though with an option in advanced preferences to use the previous ones.