In celebration of Father’s Day, Tom Maxwell shares a sweet and funny essay about music and his daughter, Evelyn. My daughter Evelyn has an incredible ear. For me, musical pitch has always been a subjective exercise, an approximation. I consider myself a vocalist, not a singer. If I have to pick out one of my songs on the piano, the melody flies out of my voice. I become unsure of the intervals and sink into a quagmire of relativism. Evelyn has no such issues. Many years ago, I…