Mary Dell writes: At last week’s ceremony for the new Nasir Jones Hip-Hop Fellowship at Harvard, honoree rap artist Nas remarked “Hip-hop is important like computer science. The world is changing. If you want to understand the youth, listen to the music. This is what’s happening right underneath your nose.” Though the value of computer science and the eternal bond between youth and music are indisputable, hip-hop is not anywhere near my nose. In fact, once Steve Jobs invented the iPod in 2001, the teen music we shared in our home went radio silent.