Here is a technique used by great deals of Blues gamers like Big Bill Broonzy and Mance Lipscomb to call a couple.I initially heard it through gamers like John Renbourne and Wizz Jones in the early 70’s in the UK. I attempted to keep it simple.Just shot and keep that dead thumb bass strong on 4 beats in the bar. Tabs on my website. www.maxmilligan.co.uk
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http://www.amazon.com/Milligan-Max-Acoustic-Fingerstyle-Ragtime/dp/B008NA3HWC