DESCRIPTION:
Every single Under Cover of Night adaptation (this was made before the release of H2A, so not that). Here's a list of the music:

Halo: Combat Evolved - Under Cover of Night 0:07
Halo: Combat Evolved Anniversary - Cloaked in Blackness 3:46
Halo 2 - Antediluva (High Charity Suite) 7:26
Halo 2 - Wage (Delta Halo Suite) 7:54
Halo: Legends - Delta Halo Suite (Remake) 10:15
Halo 3 - Dream Again (actually a double remake, which also includes Perhance to Dream from Combat Evolved) 11:38
Halo 3 - Follow Our Brothers 13:07
Halo 3 - Underestimated 14:02
Halo 3 - Duty Bound 14:39