What riffs, guitar, keyboard, or otherwise, are your favorites?
Still of the Night ~ Whitesnake...This is one of the best metal tunes of all time in my opinion. The main riff kicks you in the teeth and then kills and destroys you.
Holy Wars...The Punishment Due ~ Megadeth...Like the previous song, the riff in this one takes no prisoners.
For Whom the Bell Tolls ~ Metallica...Insert more doom and destruction here.
I'm the One ~ Van Halen...I've always loved EVH's use of single-note lines in his riffing and this one is one of the most wild-sounding riffs I can think of. Classic.
Tie Your Mother Down ~ Queen...My favorite Queen tune of all time. Great vocal for sure by Mercury but the guitar riff is what seals it for me.
Let's see some other nominees...