The Jazz Guitar Chord Dictionary
  1. 07-18-2024, 08:39 PM #1
    Spook410's Avatar
    Spook410
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    Didn't see this coming..

    wsj.com
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  2. 07-18-2024 08:39 PM
    The Jazz Guitar Chord Dictionary

     

    The Jazz Guitar Chord Dictionary
     
  3. 07-19-2024, 08:18 AM #2
    RJVB
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    Fortunately wsj didn't paywall all information allowing to find the origin of this device, here's just the 1st three hits on a YT search for "third thumb The Plasticity Lab" :





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