The Concerto for Mannequin Head is a purely speculative reconstruction of the only known example of folk music of the Haptu’i, a sentient amphibian species native to Gleise 581 c (an Earthlike planet orbiting a red dwarf star about 20 light-years Libra-ward from us). Transmissions from the Haptu’i were discovered by SETI in 2005 but not decoded until last year, when Arecibo Observatory scientist (and amateur guitarist) Evan Cale noticed that the successive transmissions, when arranged concurrently, resembled a musical score. This electronic piece is thus hobbled together from both these scores and what little we know of Haptu’i culture and physiognomy. I did most of the work on deciphering the harmony, which seems alternately based on symmetrical chords and the multiplication of frequencies (I have not been able to find a link between the two), and Mannequin Head did all the physical modeling and self-programming to emulate the larynx and vestibular chambers that (we presume) give the Haptu’i vocalizations their signature sound. This piece is dedicated to Wendy Carlos.