Mates of State are an American indie rock duo, active since 1997. The group is composed of the husband-and-wife team Kori Gardner (vocals, Yamaha Electone and Hammond B-3 electric organs, microKORG and Casio synthesizers, Yamaha and Rhodes electric pianos, piano, and occasional guitar) and Jason Hammel (vocals, drum set, glockenspiel, other percussion, and occasional Casio synthesizer).