Best guitar solo...
 

What is it?
A couple of my personal favourites are:
'No more tears' solo - zakk wilde (ozzy)
'Unforgiven solo' - Kirk hamlett (metallica)
Also 'eruption' by van halen is pretty good.

Oh yea, and if you could provide an MP3 of your choice it would be much appreciated :) (i will upload mine if anyone wants to hear em?)

who HASN'T heard those?

new millenium cyanide christ - meshuggah (yeah they suck, but the random note solo is always fun )

cleansed in pestilence - morbid angel ( actually i just like the rythm part of this solo)

abigor - cryptopsy (i hate the french)

stairway to heaven - led zep (hahahah just kidding, jimmy page is dumb)

Swarm of the formless - spawn of possession (YOU ONLY WISH YOU WERE THIS BRUTAL)

okay im tired of typing.

ted nugent-stranglehold
angel witch-atlantis

Detroit Rock City- Ace Frehley
for serious though, gutiar solos are so unmetal >:
jk though for real seirosuness what I'm really all about is like the guitar solo from Green Carnation's Light of Day, Day of Darkness, the one that happens at the 42 minute mark or so.

seriously thoguh, Detroit Rock City solo kicks ass
:rock
maybe the various gutiar solos from Awaken the Guardian, especially the opening one from Guardian

'Inca Roads' & 'Any kind of pain' by Frank Zappa

Devin Townsend - Deep Peace.
Dream Theater - Endless Sacrifice

word :rock

but also

Montana - Frank Zappa :rock

Blue Sky by the Allman Brothers

In Memory of Elizabeth Reed - Allman Brothers (eventhough that might be conisidered a duet)

'Round Midnight - Wes Montgomery

Too Fast - Leo Kottke

the still born one-necrophagist
tonguless God-scariot
are some of my favorites also the cylnic by scariot

Into the Everflow by Psychotic Waltz has some of the best double-leads ever recorded.

But technically speaking, any Behold... the Arctopus song is just one big solo and they're always impressive.

Maudlin of the Well are really impressive when their lead guitarist shreds out, but also the more reserved stuff works nice so what goes on in the end of 'A Violent Mist' is excellent. For shred madness - Gleam in Ranks.

The accoustic-then-electric solo by Matheos/Aresti in Fates Warning's 'Monument' is great.

Watchtower. Oh man. Where to start. God damn it. Almost everything is miles more advanced than most other metal, but a favourite solo is in 'The Eldritch'.

And I'm not uploading a thing. Go buy a record or two.

Damage Incorporated.... GO!!!

Queen - Loverboy

Wes Montgomery is the shiznit. I love Camp Meeting