I expect that lyrical repetition has been around for as long as singing itself. It’s a potent device. If you want to write a hit pop song, get yourself a simple, singable chorus and a catchy hook, and lean into it hard: just drill it into your listeners’ heads. And whatever lyrical gymnastics you’re pulling off in your rap track, whatever rapid-fire vocals and complex internal rhymes, make sure you’ve got a good call-and-response chorus to get the audience bouncing. And to go back further, if you’re an ancient Hebrew lyricist, you too can put these techniques to work. Enter Psalm 118.