These vids of the Dawg sitting in with the Jefferson Starship were just posted a couple days ago on YouTube. I don't ever recall seeing David playing an electric F5 (probably not a Loar). It even appears to have his signature "Dawg" on the headstock. I was a bit blown-away when seeing this for the first time. Anyone have any additional info or insights?

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Nice version of Bluegrass At the Beach @ 1:08:25