This YEM begins exactly like the versions we hear nowadays.  The
entire opening segment is standard.  Trey fumbles before nailing
the first "Note" at 4:05, and jams carelessly around it... blah.

"Boy" at 5:29 after a good scream, which strangely mellows out just
before "Boy."  Trey mellowly sings the BMGS/WUDMTF vocals.  Odd tramps
segment.. with Fish adding fills between some of Page's extremely laid
back soloing (Trey and Mike play in the background, fwiw... they don't
drop out completely.. they just provide rhythmic support).  Page
starts funking fiercely around 9:15 or so to build a nice climactic
closing groove.  Trey comes in more strongly around 9:30, too, and
throws in his two cents with some serious chops and licks...

At 11:49, the jam segment ends but Mike doesn't become particularly
prominent at all.  Trey softly and repetitively chords for a bit and
then, with Mike and Page, begins singing the chorus of "You're No
Good, You're No Good, Baby, You're No Good," which they *clearly* mock
(Trey screams the lyrics).  At around 13:15 they sing a few WUDMTF
vocals before breaking out into "You're No Good" again, with Trey
laughing hysterically.  Trey teases AC/DC Bag with the "You're No
Good" chords.  They just close out the jam and End.  Total time a mere
14:12.  Have to give this version a B- just for the novelty of "You're
No Good" (a cover -- I fortunately can't recall who "wrote" this
"song).

"Undun" (Guess Who cover) "sung" by Fish comes next, and is one of the
Most Hysterical Events I've ever heard Fish "perform."

two cents
charlie