The diddley bow is a single-stringed American instrument which influenced the development of the blues sound. It consists of a single string of baling wire tensioned between two nails on a board over a glass bottle, which is used both as a bridge and as a means to magnify the instrument’s sound.
source/image(PrtSc): NightHawkInLight
In this video I show how to make a guitar using recycled materials and an incredibly simple design. We only need three parts, and 2-3 knots. The parts used for this project are a 2 liter bottle, a 3 foot length of ½ inch diameter PVC pipe, and a piece of string. NightHawkInLight
I use fairly strong gardening string for the bass version of this guitar, and kite string for the standard tuned guitars. Fishing line would be another great option.
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The Diddley bow derives from instruments used in West Africa. There, they were often played by children. The diddley bow is easy to make and fun to play.