That's because he doesn't sing. He writes some songs, plays the guitar on them, and has someone else (right now Myles Kennedy from Alter Bridge) handle the vocals. If anything, he sang backup vocals on a few GNR songs.
"Commit yourself to what you love, and things will happen."
- Mika Vandborg, Electric Guitars, "Follow Your Heart"
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Gear:
Chateau PS-10 Cherry Power-Strat
Epiphone G-400 LTD 1966 Faded Worn Cherry
Epiphone Les Paul 100 Ebony (w/ Oil City Pickups Scrapyard Dog PLUS pickups)
Epiphone ES-345 Cherry
Fender 2014 Standard Stratocaster Sunburst
Martin DX1K Acoustic
Fender Mustang II Amplifier
Jet City Amplification JCA22H Tube-head and JCA12S+ cabinet
Pedals...