One of the biggest obstacles I've overcome in my life was thinking I didn't deserve to be successful. Artistically I'm not as much of a heavyweight as someone like Paul Simon or Joni Mitchell, because I'm not a creator of original music, and I worried about that for years.

I speak my mind and come from a place of conscience, as well as have fun as a musician.

Playing guitar was one of my childhood hobbies, and I had played a little at school and at camp. My parents would drag me out to perform for my family, like all parents do, but it was a hobby - nothing more.

In 1967 I entered Harvard as a freshman, confident - in the way that only 17-year-olds are - that I could change the world. My major was African Studies, and my plan was to travel to Tanzania, where President Julius Nyerere was creating a government based on democracy and socialism.

I was raised with the blessing of being involved with peace and social justice, and the environmental movement. I have my parents to thank for that.

When it's a funky uptempo song, you're basically having the same kind of release you would have when you have sex, only it lasts longer. Whether you're playing it on the guitar or on the dance floor, you're in that moment.

I think I'm a living embodiment of, 'Don't try to push me around or squash me,' whether its how I talk to a record label or in my relationships.