"My philosophy," said Michel Petrucciani, "is to have a really good time and never to let anything stop me from doing what I want to do." Nothing unusual about that, one might think. But since Petrucciani was an adult standing only three feet high and weighing 65 pounds, one might expect his ambitions to have been, so to speak, closer to the ground. But, had he not aspired to achievements above his station, he might have chosen to play something more convenient such as the harmonica rather than …