ATTENTION: Credits to the original writers/authors/composers/artists/designers. None of the art/images/songs/music/sounds etc. used in this video are mine.
Now that that's cleared up, enjoy an hour long mix of relaxing, maybe moody, ambient themes from the Metroid franchise, specifically Metroid Prime Trilogy, Super Metroid, Other M, and Samus Returns.

Incorporated Tracks:

0:00:00 Title Metroid Prime
0:01:21 Surface of SR388 (Ambience) Metroid: Samus Returns
0:03:33 Ancient Chozo Ruins Metroid Prime
0:05:00 Dark Torvus Bog Subterranean Theme Metroid Prime 2: Echoes
0:07:00 Brinstar Red Soil Metroid: Samus Returns
0:09:50 SkyTown Elysia Metroid Prime 3: Corruption
0:13:00 Wrecked Ship Frigate Orpheon Metroid Prime
0:16:29 Bryyo (Ice) Metroid Prime 3: Corruption
0:19:49 Torvus Bog Subterranean Theme Metroid Prime 2: Echoes
0:27:10 GFS Olympus Metroid Prime 3: Corruption
0:28:56 Pirate Homeworld (Landing Zone) Metroid Prime 3: Corruption
0:30:17 Sky Temple Grounds Main Theme Metroid Prime 2: Echoes
0:33:38 Crateria (Zebes Planetfall Interior) Super Metroid
0:36:06 Derelict Space Station Metroid Prime
0:36:57 Ing Hive Main Theme Metroid Prime 2: Echoes
0:38:51 Tallon Overworld Metroid Prime
0:42:46 Ancient Chozo Ruins Part 1 Metroid: Samus Returns
0:45:30 Maridia (Swampy Caverns) Super Metroid
0:47:37 Environment Sound (Intrigue) Metroid: Other M
0:48:51 Phazon Mines Metroid Prime
0:49:33 Agon Wastes Main Theme Metroid Prime 2: Echoes
0:51:46 Caverns Part 2 Metroid: Samus Returns
0:54:31 Landing Site Metroid Prime 2: Echoes
0:56:05 Planet Tallon IV Metroid Prime

Artwork credit: https://wall.alphacoders.com/big.php?...
*I did my absolute best to track down the original artist to give them credit and have not succeeded. If anyone knows the artist, or if the artist finds this and would like to be credited, please comment below.

Music/Sound Design credit:
Super Metroid Composer and/or Sound Designer: Kenji Yamamoto, Minako Hamano
Metroid Prime Composer and/or Sound Designer: Kenji Yamamoto, Kouichi Kyuma
Metroid Prime 2: Echoes Composer and/or Sound Designer: Kenji Yamamoto
Metroid Prime 3: Corruption Composer and/or Sound Designer: Kenji Yamamoto, Minako Hamano, Masaru Tajima
Metroid: Other M Composer and/or Sound Designer: Kuniaki Haishima
Metroid: Samus Returns Composer and/or Sound Designer: Daisuke Matsuoka