Repetition in pop is a key part of its appeal, as essential in Little Richard's Tutti Frutti as it is in Big Shaq's Man's Not Hot. That said, a sterling 2017 report by Daniel Morris on repetition in pop lyrics suggests that hit songs are getting closer and closer to a one-word lyric sheet.

The Lempel-Ziv algorithm is a lossless way to compress data, by taking out repetitions, and Morris used it as a tool to examine 15,000 songs from the Billboard Hot 100 from 1958 to 2014, reducing their lyrics down to their smallest size without losing any data, and comparing their relative sizes. He found two very interesting things. The first was that in every year of study, the songs that reached the Top 10 were more repetitive than their competition. The second is that pop has become more repetitive over time, as Morris points out: "2014 is the most repetitive year on record. An average song from this year compresses 22% more efficiently than one from 1960."

Of course, none of this means that pop songs are any less fun. They may be slower and sadder than before, but if pop songs are now simpler and louder and more repetitive than they used to be, that might make up for it. In fact, a 2011 report called Music and Emotions in the Brain: Familiarity Matters, compiled by a team led by Carlos Silva Pereira suggests that the human brain enjoys knowing what is coming next in music. Having conducted fMRI scans on people listening to songs, the report concludes that, "Familiarity seems to be a crucial factor in making the listeners emotionally engaged with music."

So the quicker a song can become familiar, the more chance there is that listeners scooting by on streaming services will stop and play it again. Which would imply that if anything, modern pop music is more fun than ever before.

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