Two-string soloing can help force you away from the muscle memory licks and patterns that so many players feel trapped by.
A step-by-step breakdown of Vai's hurricane-speed lick from the guitar-duel scene in the 1986 feature, 'Crossroads.'
The Aeolian mode is your shortcut to take the box shapes you already know and expand your approach to minor chord soloing.
Learn the correct way to play Black Sabbath's "Paranoid" riff from the writer himself in this classic GW lesson.
Dress up your riff ideas with murky, monstrous-sounding, aggressively attacked chord figures and patterns.
If you don't happen to have synesthesia, that doesn't mean you can't use its general concept as a compositional tool.