On 2/22/74, at Winterland, the Dead played BIODTL with a 22-beat opener. Or, as Bobby thought of it, “Just keep hitting an F chord until Garcia nods at me.”
P.S. Check out 11 minutes into the Playin’, when Garcia starts paying the twisty little riff to Slipknot! for the first(?) time. Billy sure didn’t know what was going on.
P.P.S. AND THEN HE PLAYS IT AGAIN IN EYES. I JUST POOPED WITH JOY. AND OREOS.