Phone 69
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Phone 69 is a technique used in the creation of experimental music whereby two cellular phones are held head to tail so that the receiver of each picks up sound from the transmitter of the other. External noise entering either transmitter is gradually warped and amplified over the course of several seconds, often creating ethereal soundscapes. The effect of this technique roughly approximates the effect of an echo effect pedal, although Phone 69 results in a far more abrasive sound.
Phone 69 was invented in 2006 by Chicago experimental musician J. "Diggs" Manning for use in his piece Orgiastic Sounds of Globalization. Since the release of this piece, Chicago area musicians Tape have skillfully incorporated Phone 69 into hip hop music using it alongside more traditional sound-manipulation techniques.

