Marty Schwartz uploaded his first guitar tutorial in order to make sure one of his students was practicing. He now teaches people online through guitar tutorials and gets 7 million views a month.

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Sean Burke’s idea for putting a guitar lesson on YouTube was simple: He had always enjoyed playing his guitar, an instrument he first picked up 32 years ago during the 1988 Calgary Olympics, and ...

Forbes contributors publish independent expert analyses and insights. Peter Suciu covers trends in the world of aerospace and defense. There is the old joke "How do you get to Carnegie Hall?" The ...