Okay. Y’all heard of Bo Diddley.  Here’s the Diddley Bow played by a master, Seasick Steve.  All rhythm – raw as all get out. From Wiki, here’s the equipment featured in that video:

The One-Stringed Diddley Bow — This is a one stringed string instrument played with a slide (He uses an old screwdriver for this purpose). It consists of a 2-foot-long (0.61 m) 2×4, with a semi-loose piece of broom wire nailed to it at both ends. It was made especially for him by James ‘Super Chikan’ Johnson.
The ‘MDM’ (Mississippi Drum Machine) — A small wooden box that is stomped upon, providing percussion. It is decorated with a Mississippi motorcycle license plate (“MC33583”), and a small piece of carpet.

And now, comin’ atcha over the mojo wire, is The Overnight Open Thread.