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(Bombycilla cedrorum) Extremely high pitched birds with very narrow variation of either a sustained or a trilled note, dropping slightly in pitch, about .5-1 second in length. These birds sing in mobs to produce difference tones, psychoacoustic 'heterodyne frequencies' which are heard as the difference between two frequencies sounding together, which along with microtonal trills make the birds sound much bigger.
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from
Flying Mobiles, for violin and electronics,
released February 20, 2015
original recordings by Geoffrey A. Keller, from the Cornell Lab of Ornithology courtesy of the Macaulay Library. Track art is the gallery display of manuscripts and compositional materials produced in composing 'Flying Mobiles' during 'Bird Captures' exhibit at BT&C Gallery.
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