what artist has done a solo that has really intregued you? For me, it was Jimmi hendrix at woodstock 69 with the star spangled banner

Erm if we're talking guitar solos then there are many which i find both amazing and fascinating.

Michael Angelo (Master of Shredding a guitar) in No Boundaries. Its basically one big 4 minute solo, were he shreds his guitar to pieces.

Most solos by Alexi Laiho of Children of Bodom are pretty awesome too, in particular in Mask of Sanity, Follow the Reaper and his two in Kissing the Shadows.

For Keyboard solo's, id say Janne Warmen (also from Children of Bodom), in Hatebreeder, and Kissing the Shadows.

These guys really know how to do an impressive solo!

Michael Schenker-Any solo from UFO's Lights Out
Toy Caldwell-Marshall Tucker Bands version of Ramblin
Eric Clapton-solo on Ramblin on My Mind from 1975's E.C was here
Jimi Hendrix-Live version of Red House from the Isle of Wight
All solos by Michael Gurley on DADA'S first cd, Puzzle

Jimmy Vincent with his drum solo in "Sing Sing Sing" while wearing a gorilla mask.
Impossible to top.

I actually prefer Gene Krupa's solo with the Benny Goodman Orchestra.

Anything jazz related usually is accompanied by a pretty darn good solo.

I'd check out the GRP All-Star Band
when the boys do John Coltrane's 'Blue Train'
the first tenor sax solo is just sick.

tenor sax duel from 'Cottontail' off the Eddie Reed Big Band album 'Hollywood Jump'

just too many to list
I could go through my hundreds of jazz recordings and keep digging up gems

In Black Sabbath's, 'NIB'. That's an awesome guitar solo!