Mates of State are an American indie rock duo, who have been active since 1997 when they formed in Lawrence, Kansas, United States. The group is composed of the husband-and-wife team Kori Gardner (vocals, Electone and Hammond B-3 electric organs, Casio synthesizer, and Rhodes electric piano, piano, and occasional guitar) and Jason Hammel (vocals, drum set, glockenspiel, other percussion, and occasional Casio synthesizer).

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