The user plays on a Dobro slide guitar. The guitar sits on his lap. He uses a shot glass that sits on the thumb of his left hand as a slide and slides it against the guitar strings.
The guitar can be tuned to different open chords. The user has slides made of glass, aluminum, and brass to get different sounds. A basic course for slide and Dobro is available on DVD and can be purchased in well-stocked music stores. You can also find tips on Youtube.
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This tip is from 2008