Like most of their songs, Coma by Guns n' Roses is in Eb tuning. That means if you are in standard tuning, drop each string by 1 note to:
Low Eb : Ab : Gb : Db : Bb : Eb
The song is long, so we're dividing it into 3 parts. However, it's length is largely due to the fact that many of the riffs are repeated time and again. You could learn this 1st part of the song, and know most of all the main song parts.
We recommend starting with this ActionTab. Here we see Slash playing all the main riffs (Izzy's rhythm guitar pretty much plays the same stuff anyway). If you concentrate on learning this ActionTab you will know most of what you need to play the song. It's not a very hard song to play (by Gn'R standards). Here's the riffs:
Intro - Nice and simple build up leading into the main riff.
Main Riff - This is the signature riff of the song, and the one that most people want to learn first. It's played exactly the same by Izzy, except the last tail. Izzy descends through powerchords, whereas Slash ascends up through higher powerchords.
Verse 1 - A simple chord progression. Use double stabs followed by palm muting on each chord. Meanwhile Izzy plays lower backing chords (with no palm muting) to beef up the sound. There are small sections of standard chords which act as mini-bridges during the verses.
Verse 2 and Verse 3 - These follow the same structure and format as Verse 1, just using lower chords.
Bridge - This powerchord section links to the following main riff again.
Heartbeat - This next part is where the 'heartbeat' plays in the song. It's short and simple for the guitar. Afterwards the song reverts back to the previous riffs until the following bridge....
Bridge - We end Part 1 with this section of the song. It gets a bit climactic, and then slows down as it melts into the gentle interlude (which is the next part of the song).