I think I've linked to Derek Sivers blog once but his posts are an absolute treasure trove. I think this particular post is taken from his book Hell Yeah Or No.
Whether you’re a student, a teacher, or a parent, I think you’ll appreciate this story of how one teacher can completely and permanently change someone’s life in only a few lessons.
Before I met Kimo, I was just a kid who wanted to be a musician, doing it casually. Ever since our five lessons, I’ve had no speed limit. I owe every great thing that’s happened in my life to Kimo’s raised expectations. A random meeting and five music lessons showed me that I can do way more than the norm.