Not doing levequests lately, so I'm not 100% sure on the levequests themes lol.

11 - Plays during some beast tribe related quests, Toll of the Warden comes to mind.
12 - Boss battle
13 - Thanalan levequest
14 - Levequests somewhere, I guess
15 - Cutscenes, lot of em
16 - more cutscenes
17 - no clue, guess it's not used currently.
18 - cutscenes. Or path of the twelve theme. Not sure.
19 - cutscenes.
20 - not sure if it's in game.
21 - cutscenes
22 - Limsa Lominsa theme
23 - La Noscea theme
24 - cutscenes
25 - Chrono Cross Mistbeard Cove theme
26 - This one is currently used as some area theme, isn't it?
27 - Christmas Event
28 - Unused, I guess.
29 - New year's event
30 - Summer event
31 - Unused, I guess.
32 - Quest complete
33 - Wild Arms Chocobo theme!
34 - Unused.
35 - Final boss theme. Hulk sure.
36 - Behest boss theme and / or levequests when monsters run. Not sure.
37 - Star Ocean unused.
38 - Dzemael Darkhold / Toto Rak
39 - Nail of the Heavens (La noscea battle)
40 - La noscea levequest
41 - Primal Judgement. 100% sure it's gonna be Primal Battle Theme.
42 - Not used.
43 - Quicksand (thanalan battle)
44 - Intro theme
45 - Travanchet's theme.
46 - Almost sure this played during Forever Taken main quest.
47 - Garleans kicking ass (Garlean Empire's Theme).
48 - cutscenes.
49 - Plays during those early escort missions
50 - not sure if it's in game.
51 - not sure if it's in game.
52 - cutscenes.
53 - not sure if it's in game.
54 - Market Wards theme
55 - Mor Dhona theme
56 - not sure if it's in game.
57 - updater, oh god the damn updater.
58 - black shroud theme
59 - La noscea theme #2
60 - Coerthas hamlets instances / probably Ishgard's theme
61 - Coerthas theme
62 - 100% sure it's not in the game.
63 - Black shroud theme #2
64 - boat ride
65 - Ul'dah theme
66 - not sure if it's in game.
67 - Parley
68 - not sure if it's in game.
69 - fieldcraft guildleve
70 - synthesis.
71 - not sure if it's in game.
72 - A WINNER IS YOU


Feel free to correct me ~