These are amazing lessons and tips from many great players on YouTube. If you enjoy these lessons, please make sure to buy the full quality DVDs and other merchandise from the artist.

Paul Gilbert
Improvisation: Picking, Arpeggios, Tapping, Legato, Phrasing, String Skipping, Alternate Picking, Palm Muting. (Rock, Metal, Classical, Neo-Classical, Heavy Metal)
Eric Johnson
Improvisation, Shred, Jazz-Rock, Progressive Rock, creative rock, technique.
Al DiMeola
Improvisation: Rhythm, Phrasing, Timing, Alternate Picking
Steve Vai
It's Steve Vai... Nothing needs to be said.
Guthrie Govan
Improvisation: Funk, Fusion, Shred, Hard Rock, Legato, Tapping, Minor Blues, Reggae, Jazz-Fusion, Artificial Harmonics
Alex Hutchings
Improvisation: Jazz Fusion, Hard Rock, Funk, Blues
Robben Ford
Contemporary Blues, Comping, Chord Voicings, Licks, Bending, Improvisation
Larry Carlton
Blues, Jazz-Fusion, Jazz-Blues, Contemporary Blues
Michael Angelo Batio
Improvisation: Picking, Sweeping, Arpeggios, Tapping, Legato, Phrasing, String Skipping (Rock, Metal, Neo-Classical, Heavy Metal)
Yngwie J. Malmsteen
J!!!, Neo-Classical metal, shredding, sweeping, alternate picking, modes, arpeggios