Questions about the HAIR CD

So the four questions I have...

1. Not only is Harris Doran yummy but he can sing (the reprise of Manchester, England in The Flesh Failures proved it)...how much does he actually sing on the recording?

2. Where does Julie Garnye sing on the recording? I know everyone was making a big thing of her from the concert. I just want to hear for myself.

3. What does Gavin's song (Going Down) mean in the context of the show? I've only seen the movie and it was a few years back.

and 4. Who are the two women who sing after Harris sing the Manchester, England reprise in Flesh Failures?

By the way, the CD is amazing...the only tracks I don't like are Donna (not too fond of Lea's voice on that track) and Sodomy (great song but Jai just doesn't do anything for it). My highlights are Julia, Eden, Jennifer, Lillias, Gavin, Adam...well, all but the two I mentioned.

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The Julie Garnye Topic is somewhat controversial. She remains on the recording in the Tribe, but Sherie Rene Scott sings "Walking Through Space" on the cast recording (which was originally supposed to be Idina for the concert and Julie was the lucky understudy who got to go on).
I know Harris sings during "Manchester, England" with Euan, "Hair" with Raúl, "How I Love My Hippie Life" with Eden and "The Flesh Failures" with Norm Lewis