He Came from Outer Space: A Profile of Barry Zito
From 2002:
THE UNIVERSE demands that for every beginning, there is an end--for every molecular cloud, there is a white dwarf--and after Barry's first game of organized ball, Joe retired from the music business to guide his son to his destiny. He knew nothing about baseball, and less about curveballs, but he read books and watched tapes, and every night he would pass on the lessons to Barry in their San Diego backyard. "I thought playing baseball was a lot like playing the piano," says Joe. "To get better, you practiced and practiced and practiced some more."