The classic "shuffle beat" goes kinda diddley diddley diddley diddley  rolling along, kinda like a train. Sometimes faster sometimes slower. This one's faster: Rory Gallagher, speeding along with the Souped
Up Ford:  



Please forgive the use of the capo'

A bit more sedate with the Bad Penny:

:

Yeah every rocking guitar player looks like an idiot with his mouth open like that.  It's the same thing as snipers and explosive experts -  it diminishes the sound pressure levels in the ears.  Keeps your ears from blowing out.  Just makes you look like a fucking idiot.

Saw Rory a couple of times in Houston, bought him a beer.



And this one just makes me cry: