The Themes (incomplete):

Dwarves

• The Dwarf End Cap

Gondor

• Faramir And Denethor
• The Realm Of Gondor
• Minas Tirith
• Gondor Reborn

Isengard

• Isengard

Nature

• Nature's Reclamation

Sméagol-Gollum

• Slinker
• Stinker

The Fellowship

• The Fellowship

Rohan

• The Rohan Fanfare

• Éowyn:

           Éowyn And Aragorn
           Éowyn And Théoden
           Éowyn,  Shieldmaiden Of Rohan

Monsters

• Shelob
• The Mûmakil

Mordor

• The Evil Of The Ring
• The Cruelty Of The Orcs
• Mount Doom
• Five-beat Pattern
• The Power Of Mordor
• The  Threat Of Mordor
• The Way To Mordor
• The Orcs Of Mordor/ The Witch-king
• The Fate Of The Ring
  

The Army Of The Dead

• The Army Of The Dead

More themes to come.