Radio is the medium of “Murder Most Foul,” and perhaps Dylan’s preferred medium as well. “I can’t remember when I was born and I forgot when I died,” as Dylan will sing later on Rough and Rowdy Ways. Rough and Rowdy Ways, I came to believe, is his real Nobel Lecture—­a lecture from inside his own forms and idioms, from inside the same artistry that earned Bob Dylan the Nobel Prize. For “Mother of Muses,” Dylan entreats Mnemosyne, the goddess of memory, and categorically affirms the epic aims of Rough and Rowdy Ways. “I’m falling in love with Calliope.”“Murder Most Foul” was Bob Dylan’s first number 1 song ever on a Billboard chart.