5 amazing solos from songs as opposed to instrumentals:

Hangar 18 - Megadeth - Marty Friedman/Dave Mustain
Defensive Personalities - Death - James Murphy/Chiuck Schuldiner
Shy Boy - Dave Lee Roth - Steve Vai
Dark Night - The Scorpions - Uli Jon Roth (from the 70's)
New Order - Testament - Alex Skolnick

If you're into death metal and shred, Nocturnus 'Thresholds' album beats any of the above on every single track. Didn't mention them above as most people have never heard their stuff...shame!