Is it a riff? A hook? An arrangement? Whatever they are, those little earworms make a hit a hit. The songs just wouldn’t be the same without them. In this episode, Jeff and John grab their instruments to volley riffs back and forth — and muse on what makes them so special. It’s a geekish tour-de-force, covering rock, pop, funk, jazz, standards and even classical. All that’s currently missing is hearing about your own favorite riffs. Email us at [email protected]. Let’s make this a conversation!