Why is it?

That sometimes my least favourite songs get stuck in my head. Today's? Lana Del Rey's 'Summertime Sadness' (or whatever it's called). :( And my, it's long and repetitive. Sorry if you're a fan. I don't care for it. I also don't like Florida Georgia Line's 'Cruise' and turn both off when the songs play on the radio. And I have a pretty wide range of music that I like--Celtic, folk, blues, jazz, show tunes, Oldies, opera, world, Motown, rock, pop, country, metal, even some rap, if it's incorporated into actual music. I don't care if it's hokey, edgy, weird, or whatever, so long as it's good.