Circulatory System is a psychedelic rock musical ensemble formed by musician/painter Will Cullen Hart, and featuring Charlie Johnston, Derek Almstead, Peter Erchick, John Fernandes, and Heather McIntosh.
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 exceptions 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 debut album, but was only briefly part of the touring version of the band.
A second full-length album is expected to be completed in 2008. The band has anticipated it with the release of the new songs "Tiny Concerts", "Path of the Parallels" and "Same Place" at their MySpace page.