Hart is famous for his work in the Elephant Six Collective as one of the lead players in the The Olivia Tremor Control. After the band disbanded in 2000, he and most of the other former Olivias formed Circulatory System, with the exception of Bill Doss, who was focusing on his solo project Sunshine Fix, and Eric Harris. Neutral Milk Hotel's Jeff Mangum also contributed to their albums, but was only briefly part of the touring version of the band.
A second full-length album, Signal Morning, was released on September 8, 2009. The song "Overjoyed" was released as a single.
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