The canonical version of the canonical work by this band was played at the Fillmore on 2/27/69 and released on Live/Dead. This particular performance is like chamber music.
If my husband and I had to pick "our song", Dark Star in any version would probably be it. So this will be my Eternal Jam.
(This streamable track from a fan-traded tape is unfortunately tracked without the intro; you can hear the whole tape at https://archive.org/details/gd69-02-27.sbd.16track.kaplan.6315.sbeok.shnf )
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Used thereafter as a jumping off point for the band's spaciest live jams, this song began life on the other side of the single Born Cross-Eyed in 1968, and was recorded as a single during the sessions for Anthem Of The Sun.