drive-by: GD 4/15/70 jam: hottest six minutes of the decade?

I don't have time to go full chapter-and-verse on this one: what I know is at Jerrybase.

I give you what's laconically labeled Grateful Dead's "Jam (with Guests)" 4/15/70 at Winterland.

https://archive.org/details/gd1970-04-15.132734.sbd.reel.latvala-eaton-wise.flac16/t10.flac

or

https://relisten.net/grateful-dead/1970/04/15/jam-with-guests?source=88717