Tom Morello from Rage Against The Machine started playing guitar at the late age of 17.
As a late starter, he believes in the Malcolm Gladwell's 10,000 Hour Rule (10,000 hours of "deliberate practice" are needed to become world-class in any field).
"And then my obsessive compulsive disorder took over and I began practising four, six, eight hours a day 365 days a year while pursuing a political science major at an Ivy League university." "There was a time I would practice 8 hrs a day, every day. 2 hrs just technique & scales, 2 hrs music theory, 2 hrs learning songs & writing songs, and 2 hrs just jamming along with random radio stations and improvising over chord progressions."
Tom Morello guitar secret is written on his shirt.