These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ear Worm: For a complex song, "Talybont" can be seen as this.
Hell even "Knots", "Wreck" or "Proclamation" are very catchy really. Just accomplish this via slightly unusual tunes. It could be argued that Gentle Giant is one of the more catchy prog bands.
