So is there like a complete list of missing music somewhere because if there is then I would be interested in seeing it. Also, do you know whether the music is missing based on serial, or is it randomly interspersed? Example: Would all of the music from say The Myth Makers be completely missing and all of the music from the Abominable Snowmen be intact, or would both serials be missing music?
I can only list which have music that survives and I hope that gives an idea as to just how much of the music is sadly missing.
All below info is based on what's been released
and the booklet for the 50th anniversary 11 disk soundtrack which states which music tapes survive.
The Daleks (complete) - Tristram Cary
The Daleks' Master Plan (complete) - Tristram Cary
The Gunfighters (complete) - Tristram Cary
The Underwater Menace (incomplete, only 1 cue has been released: The Fish People) - Dudley Simpson
The Macra Terror (incomplete, only 2 cues has been released; Chromophone Band & The "Macra Theme") - Dudley Simpson
Fury from the Deep (unclear, only 1 cue released: Mr Oak and Mr Quill) - Dudley Simpson
The Invasion (complete, although only a few cues have been released; The Dark Side of the Moon, The Company, Brigadier Lethbridge-Stewart & Mysteries) - Don Harper
The Seeds of Death (unclear, only 3 cues have been released; Titles, Moon Control & Ice Warriors Music) - Dudley Simpson
The Silurians (Complete) - Carey Blyton
The Mind of Evil (unclear, only 4 cues have been released; The Master's Theme, Hypnosis Music, Dover Castle & Keller Machine Theme) - Dudley Simpson
The Claws of Axos (incomplete, 1 cue: The Axons Approach) - Dudley Simpson
The Mutants (complete) - Tristram Cary
Carnival of Monsters (incomplete, only episode 1) - Dudley Simpson
Frontier in Space (incomplete, only episodes 1&2) - Dudley Simpson
Death to the Daleks (complete) - Cary Blyton
Planet of the Spiders (incomplete, only episode 2) - Dudley Simpson
Revenge of the Cybermen (complete) - Carey Blyton
Terror of the Zygons (complete) - Geoffrey Burgon
The Android Invasion (incomplete, only episodes 3&4) - Dudley Simpson
The Seeds of Doom (complete) - Geoffrey Burgon
The Sun Makers (complete) - Dudley Simpson
The Invasion of Time (incomplete, only episodes 3&4) - Dudley Simpson
All music from the 80's episodes survive except for Mindwarp.
I hope that answers all that you wanted to know about the music.