#1
My band consists of : 3 guitarists, A singer, a drummer and a bassist
I would like to know if you know any Classic Rock, Metal or w.e. songs are good to play that would accompany all three guitar parts.
#3
Wow, three guitarists, that's cool.

Hmmm, the neat thing is, you can look for songs that do overdubbing in the studios and actually play it live.

I would suggest some SoaD from Hypnotize or Mezmorize. Alot of that (Soldier Side - Full song) and whatnot have many guitar parts.

Or you could take a song and even add your own improvisations into it.
#4
Iron Maiden now have three guitarists.

Check out the stuff from their newest album.
Gear:
Ibanez S470 (EMG 81/S/85)
Sigma DMC-15E
Laney VH100R
Laney 4x12 Cab
Ibanez Weeping Demon
M-Audio ProKeys 88
Mbox 3 Pro
KRK RP6 G2's
Plum Team FTW!

X
#5
hallowed be thy name - iron maiden
you would be able to do the harmonies
#6
Something by Avenged Sevenfold, probably. They usually have harmonies between 2 guitars on the leads and a rhythm part in the backround.
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#7
Maylene and the Sons of Disaster have 3 guitarists and all of their songs are super easy.
#8
Chili Peppers - Dosed.

Put your three guitars to use and if one of you is really good, you can solo over some of the parts as well.

Edit: Plus, it's one of my favourite songs ever so I just wanna spread the word