Here's some info on Coma that I found in an old HTGTH thread. Most of the info was taken from gnrinfo.tk

Written by: "Coma" was written by Axl and Slash. Axl wrote the lyrics, while Slash wrote the music, probably with some influence from Axl.
Written in: "Coma" was written in or before 1990.

Performed live: "Coma" was played live at least 4 times between 1991 and 1993. It was performed live for the first time in Richfield, OH, June 4, 1991.

Addiional Information: "Coma" was originally called "Girth"

In Their Own Words:

Slash: I wrote some really cool shit when I was high. There's a song called "Coma", a long song, really heavy, and I wrote that loaded.

Duff: We have actually got this song calld "Girth"... Well, it's not going to be called "Girth" on the album, it'll get changed, but it's such a heavy song we call it "Girth" for now. It's named after this guy West [Arkeen], who writes with us sometimes. He's a real little fucker, right? but his dick, it's only about this long but it's like this wide, man! so he got the girth, right? so we call this song "girth"...'

Axl: It's like 11 minutes and 45 seconds long, with no chorus. And I think there was only like one verse that somewhat repeats itself. It's Slash's baby - it's his monster. The song used to be called Girth.

Izzy: It's fuckin' 15 minutes long. And I still don't know it, man. I have to take a special chord chart with me whenever we play it. There's like 50 chords at the end of it and I just can't follow them.

Axl: Writing "Coma" on "Use Your Illusion I" was so heavy I'd start to write and I'd just pass out. I tried to write that song for a year, and couldn't. I went to write it at the studio and passed out. I woke up two hours later and sat down and wrote the whole end of the song, like, just off the top of my head. It was like, don't even know what's coming out, man, but it's coming. I think one of the best things that I've ever written was maybe the end segment of the song "Coma". It just poured out. I thanked Slash for that, because I used to curse him, going, "Man, that son of a bitch has written this thing and I've got to write to it and don't know what to write." It was so hard; it made me feel like, "I don't know how to write, I should just quit." But I finally did write it, and I ended up feeling a lot better about a lot of situations that I expressed in that song.

Slash: I like "Coma" a lot. It's got a defibrillator in it - you know, the instrument that starts your heart when it's stopped. And there's some EKG beeps too. We were just fucking around, but the song is heavy, and Axl's vocals are gorgeous - I mean really amazing.

Axl: I started writing about when I OD'ed 4 years ago. And the reason I OD'ed was cos of stress - I couldn't take it. And
I just grabbed this bottle of pills, in an argument, and just gulped them down. And I ended up in the hospital. But I liked that I wasn't in the fight anymore. And I was fully concious that I was leaving. I liked that. But then I go - all of the sudden my first real thoughts were that 'ok, you havn't toured enough, the records not gonna last, it's gonna be forgotten, listen man, you have work to do. Get out of this!' And I went 'no', and I woke up, and pulled myself out of it.
But in the describing of that, some people could take it wrong, and think this means 'go put yourself into a coma'. And, so, it's really tricky, and I'm still playing with the words, to figure like, how to show some hope in there.

Duff: "Coma" is monstrous!

Slash: Mike put something on the little rhythm part between the chords. I don't know what he used. I was going for a certain kind of a sound. Since I don't use effects, I don't know anything about them, except for echoes. I told him what I wanted, and he managed to pull it out of his rack somehow.

Gilby: "Coma" [gave me most trouble] without doubt. I still don't know it. It's like this 15- or 20-minute song with no
repeats. Oddly enough, I really love playing "Coma" because it's different every time. I also like "Pretty Tied Up" and "Locomotive." I like playing the fast, hard ones.

It's good GN'R are still being brought up in the media in a positive way, even if this does come across as slightly embarrassing considering the album isn't out. This was the same magazine that's heard Prostitute and Atals Shrugged so I guess they're in a better position to comment than most on the album.

Looks like Classic Rock are looking to keep favour with GNR for whenever the album comes out. Someone's going to get that big first Axl interview, it seems CR are throwing their hats in the ring to get it.

Well for movies I thought PotC and Die Hard 4 were pretty good, nothing extraordinary but enjoyable enough.

Music, erm, probably the GNR leaks, there's been some decent songs out this year but no band or artisit has really caught my attention greatly.

Sports, Leeds Rhinos won the Super League Grand Final in October despite being the underdogs for the game. We hammered St Helens when nobody gave us a chance, great feeling. Football has been pretty bad this year, Leeds got docked 15 points before the season even began although we are holding our own in the league now. England failing to qualify for Euro 2008 was also a big dissapointment.

It's becoming the worst kept secret in music that they'll be playing shows next year. There's just too many different sources blabbing about it for there not to be any truth in it.

His performance was that good you had to tell us twice