Detailed list, thx TGFCODER:
00:14 Menu Theme from Heroes I
01:32 Biara's Theme from Heroes V
02:19 Grass Theme from Heroes II (Also in HMM6)
04:19 Dirt Theme from Heroes IV
05:15 Sorceress Heroes II theme.
05:54 / 08:20 Academy Theme from Heroes V
06:49 Academy Theme from Heroes IV
10:58 / 14:55 Grass Theme from Heroes V (Also in HMM6)
12:54 Stronghold Theme from Heroes III
18:20 Haven Theme from Heroes V (Also in HMM6)
19:18 Tower Theme from Heroes III
21:25 Barbarian Theme from Heroes I
25:08 Necropolis Theme from Heroes III
27:12 Sea Theme from Heroes II
34:11 is known as Win Scenario from Heroes III (Also in HMM6)
34:45 Menu Theme from Heroes VI
36:17 / 38:08 Sanctuary Theme from Heroes VI (Also in HMM6)
37:48 Necropolis Theme from Heroes VI
41:40 Ghosts Of The Past from Heroes VI (Slava's Theme) (Also in HMM6)