It's been a while since Petey practiced his oboe, at least in the strip. I figure it's something he does every day whether it's mentioned in the strip or not. Like the family eats dinner every night, but it's not funny enough to be worth mentioning. Hey, these people can't be funny all the time, you know. They've got lives of their own too.For earlier examples of Petey's musicianship, but not on the oboe, see here and here.