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Steamlord is the name of the theme that plays during both encounters with the boss of the same name, or with Tinbots in Metroid Prime 3: Corruption. It resembles a sped-up and heavily techno version of Mother Brain's theme in Super Metroid, with electronic percussion. Steamlord is also available in the Soundtrack Gallery of both Corruption and Metroid Prime Trilogy, and was composed by Kenji Yamamoto.
It can be heard here: .