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The main theme of Sector 1 is used for the sector in Metroid Fusion itself, as the title theme and as part of a medley in the Metroid Prime & Fusion Original Soundtracks. The song is also used in Super Smash Bros. Brawl as one of the themes that plays on the Frigate Orpheon stage. It is also used in the Metroid Prime 2: Echoes Bonus Disc when Fusion is selected in the chronicle. Sector 1 returns in Super Smash Bros. for Wii U on Pyrosphere.
The original version known as Sector 1 (SRX) SR388 Return Area is in the soundtrack.