Indepth Music Organization HELP?

[Spades68]

Theres a TL;DR or skip ahead
marked in red if your busy
and don't want to read my story
and only hear the idea

Finally after 20 years of living I'm getting around to organizing my music and buying a PMP (J3). I've ordered some custom molded in-ear headphones and have began attempting to get all the music from my past and organize it.

Simply put, every song by an artist doesn't have quite the same sound, it all varies and playing an album where half the songs are soft/depressing and the other half is uplifting/aggressive is just silly when I don't feel 2 drastically different moods at the same time.

What I've done so far:
1.) Have 12 discographies (>artist>album>songs)
2.) Removed songs from each artist that I'd never listen to
3.) Edited parts of songs, split songs, and then re-# tracks
4.) Updated tags

Let me start off by saying that I'm no audiophile and the word "genre" and the million qualifiers attached just don't work for me. The difference between Nu-Metal and Metalcore is the same as speaking a different language.

Though I will say I am quite picky about my music and when I create a playlist I want it to evoke a single mood and not a vast array of different ones. Needless to say, if I just played entire albums from single artists I wouldn't get that result, instead I'd receive some uplifting songs, some depressing, and some that just get your blood pumping with a GET SHIT DONE mentality.

TL;DR (Start here if your busy)

So I've thought out a method that I'd consider to be in its primitive stages, to organize my music so I know which song evokes what mood and could use some helpful input from the community to evolve this.

Mood Categories (help develop this)

(M) Metal - Screaming lyrics, can't really grasp what they're saying. (I figure these types of songs all sound the same and apparently are called Death Metal)

(R) Rock - Has an aggressive sound, can jam out to it, but doesn't really get your adrenaline flowing (whether it be because of the way the lyrics are delivered or the instrumentals)

(H) Hardcore - Very aggressive sound, similar to Rock but these songs keep me motivated while I run or am doing some strenuous activity.

(S) Soft - Slow/Depressing songs that tend to calm you down and make you relax.

(T) Techno - Remixes, dance anthems, trance, ect...

Now I could just label these all in the mood of the song or genre, and then I'd make a playlist for each individual category for an artist + an (A) all playlist. So it'd look like this:

(A) KoRn
(M) KoRn
(R) KoRn
(H) KoRn
(S) KoRn
(T) KoRn

Now I could endlessly mix and match playlists of the mood I'd like to listen to.

Potential Flaws: This is like I said in its baby stages and needs help to be developed, I'm drawing a blank yet I somehow feel the need for an "Instrumental" category yet that Instrumental would evoke a mood, maybe an extra qualifier on all playlists that hold instrumentals? (R)(I) KoRn and (R) KoRn as separate playlists as well as (I) KoRn.