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Metroid Fusion is easily one of the most solid soundtracks in the series, building off the orchestral hybrid found in Super Metroid. The score was composed by Minako Hamano in her directorial debut, with assistance by Akira Fujiwara. Despite the limitations of the GBA, Hamano was able to utilize some amazing samples, as in the jungle drums of "Sector 2 (TRO) Tropical Area", which also uses chiptune square waves that tie the soundtrack back to Metroid II.

Fusion's booming main themes are "Sector 1 (SRX) SR388 Simulation Area", which also plays in the introduction, and "Sector 3 Restore the Cooling Unit Timer Mission", which also plays on the road to Neo Ridley. Metroid Fusion underscores the rule that the crown jewel of the series' music is the area themes. Each BSL sector oozes atmosphere, particularly "Sector 4 (AQA) Water Level Control Area", "Sector 3 (PYR) High Temperature Area", and Sector 4 (AQA) Underwater Area". One downside is "Final Orders" plays through the entire final sequence of the game, which gets old if you're searching for that last missile pack. There are also some good boss tracks such as "VS. Ishtar/Serris, Gedu/Yakuza", but many contain a weird "parasitic" sound, as with the classic "VS. Neo Ridley".

Fusion is unique in that it contains a large number of "Environmental Sounds" for dialogue sequences, which feel like a cinematic drama or text adventure similar to Nintendo's Famicom Tantei Club series - perhaps an influence from director Yoshio Sakamoto. In addition, several tracks, such as "VS. Marukara/Arachnus" and "Sector 6 (NOC) Dark Area" sound similar to the soundtrack to EarthBound/Mother 2.

The Metroid Prime & Fusion Soundtrack contains one arranged track, but not all tracks loop. As of August 2011, the album is out of print. It is supplemented by the Metroid Fusion Original Soundtrack listed below.

METROID PRIME & FUSION SOUNDTRACK - FUSION SIDE

No.	Title	MP3 Size	FLAC Size	Length
	Download soundtrack in one zip as MP3	36 Tracks	67MB	54:29
	Download soundtrack in one zip as FLAC	36 Tracks	272MB	54:29
	Download the album art in one zip	14 Images	10MB
01	Metroid Fusion Arranged Version	7.8MB	31MB	5:19
02	Title	1.5MB	6.0MB	1:18
03	Sector 1 (SRX) SR388 Simulation Area	3.3MB	14MB	2:51
04	Environment Sound (Silence 1)	973kb	2.9MB	0:45
05	Environment Sound (Tension)	801kb	3.0MB	0:41
06	Environment Sound (Shock)	727kb	2.5MB	0:28
07	Heading to the Huge Bio-Readings	2.1MB	9.4MB	1:47
08	Tension before a Confrontation	1.5MB	2.4MB	0:39
09	VS. Marukara	1.6MB	7.2MB	1:29
10	X Invasion Detected	1.6MB	7.4MB	1:24
11	Navigation Room	882kb	3.7MB	0:48
12	VS. Core-X, Chozo Statue Second Form	1.3MB	5.6MB	1:08
13	Environment Sound (Disquieting)	813kb	3.1MB	0:38
14	Sector 2 (TRO) Tropical Area	1.8MB	7.4MB	1:34
15	VS. Zazabi, Varia Core X	2.7MB	8.4MB	1:44
16	Environment Sound (Silence 2)	1.1MB	4.4MB	1:04
17	Sector 4 (AQA) Water Level Control Area	5.2MB	22MB	4:22
18	VS. Ishtar, Gedu	2.5MB	8.8MB	1:42
19	Sector 3 (PYR) High Temperature Area	2.3MB	11MB	2:09
20	VS. BOX	992kb	4.0MB	0:47
21	Sector 6 (NOC) Dark Area	3.7MB	13MB	2:58
22	SA-X Appears	775kb	3.3MB	0:38
23	Sector 5 (ARC) Low Temperature Area	1.6MB	5.3MB	1:11
24	Sector 3 Emergency Situation	808kb	2.9MB	0:32
25	Sector 3 Restore the Cooling Unit Timer Mission	3.0MB	15MB	2:44
26	Environment Sound (Intrigue)	1.1MB	4.6MB	0:56
27	VS. Chozo Statue First Form	1.1MB	3.5MB	0:47
28	VS. Nightmare	1.6MB	4.7MB	1:02
29	Sector 4 (AQA) Underwater Area	2.8MB	12MB	2:36
30	VS. Neo Ridley	1.1MB	4.6MB	0:56
31	Final Orders	1.6MB	6.9MB	1:15
32	VS. SA-X	799kb	3.3MB	0:35
33	Station Escape Timer Mission	1.2MB	4.7MB	0:56
34	Epilogue	1.4MB	6.5MB	1:14
35	Ending	3.9MB	17MB	3:18
36	Appearance Jingle	209kb	492kb	0:06
37	Item Obtainment Jingle	272kb	700kb	0:08

METROID FUSION SOUNDTRACK (GAME RIP)

The Metroid Fusion Soundtrack supplements the official soundtrack release by including looped versions of all tracks as well as several tracks not included on the album. All tracks were made using the official soundtrack as reference, except for 1, 33, 37, 40, 41, and the extra tracks, which were made using viogsf. Also of note are the extra tracks, which include the music from the E3 2002 demo video and three unused tracks. "Unused 2" sounds as if it might have been intended for use during the Metroid escape sequence, but all tracks are incomplete.

No.	Title	Size	Length
	Download all 58 tracks in one zip as MP3	112MB	1:28:53
	Download all 58 tracks in one zip as FLAC	394MB	1:28:53
01	Opening	1.2MB	0:54
02	Title	1.9MB	1:25
03	Sector 1 (SRX) SR388 Simulation Area	6.9MB	5:25
04	Environment Sound (Silence 1)	1.3MB	0:57
05	Environment Sound (Tension)	1.5MB	1:14
06	Environment Sound (Shock)	717kb	0:28
07	Heading to the Huge Bio-Readings	2.3MB	1:47
08	Tension before a Confrontation	801kb	0:39
09	VS. Arachnus	3.2MB	2:43
10	X Invasion Detected	1.7MB	1:24
11	Navigation Room	1.7MB	1:29
12	VS. Core-X, Chozo Statue Second Form	1.5MB	1:08
13	Environment Sound (Disquieting)	866kb	0:38
14	Sector 2 (TRO) Tropical Area	3.8MB	3:08
15	VS. Zazabi, Varia Core X	2.9MB	1:45
16	Environment Sound (Silence 2)	1.3MB	1:05
17	Sector 4 (AQA) Water Level Control Area	5.8MB	4:23
18	VS. Serris, Yakuza	2.7MB	1:43
19	Sector 3 (PYR) High Temperature Area	3.1MB	2:30
20	VS. BOX	1.1MB	0:48
21	Sector 6 (NOC) Dark Area	7.1MB	5:15
22	SA-X Appears	764kb	0:38
23	SA-X Chase	585kb	0:26
24	Game Over	527kb	0:30
25	Sector 5 (ARC) Low Temperature Area	1.7MB	1:11
26	Sector 3 Emergency Situation	817kb	0:32
27	Sector 3 Restore the Cooling Unit Timer Mission	6.3MB	5:15
28	Environment Sound (Intrigue)	1.2MB	0:57
29	VS. Chozo Statue First Form	1.1MB	0:47
30	VS. Nightmare	3.1MB	1:51
31	Sector 4 (AQA) Underwater Area	6.0MB	4:53
32	VS. Neo Ridley	2.1MB	1:36
33	Final Orders	2.9MB	2:19
34	VS. SA-X	840kb	0:36
35	Station Escape Timer Mission	1.4MB	0:56
36	Epilogue	1.6MB	1:15
37	Ending	4.3MB	3:19
38	Appearance Jingle	192kb	0:07
39	Item Obtainment Jingle	261kb	0:09
40	Suit Upgrade	114kb	0:03
41	Objective Complete	144kb	0:04
	EXTRA TRACKS
X01	Metroid Fusion E3 2002 Demo Video	1.6MB	1:34
X02	BSL Ambience	2.5MB	2:22
X03	Observation Deck	757kb	0:33
X04	Power Down	526kb	0:33
X05	Environment Sound (Silence 1, Alternate)	822kb	0:57
X06	Environment Sound (Tension, Alternate)	1.1MB	1:18
X07	Environment Sound (Shock, Alternate)	564kb	0:27
X08	Navigation Room (Alternate)	1.6MB	1:34
X09	Environment Sound (Disquieting, Alternate)	921kb	0:42
X10	VS. Zazabi, Varia Core X (Alternate)	3.0MB	1:52
X11	Sector 3 Restore the Cooling Unit Timer Mission (Alternate)	6.2MB	5:13
X12	Game Over (Alternate)	483kb	0:28
X13	Sector 4 (AQA) Underwater Area (Alternate)	775kb	0:49
X14	Final Orders (Alternate)	691kb	0:31
X15	Unused 1	350kb	0:21
X16	Unused 2	1.1MB	1:15
X17	Unused 3	245kb	0:16