Semi professional musician here. Repetition goes way beyond what the author mentions:<p>- Most music is highly repetitive, often recycling 2 or 3 short segments (chorus, verse) with minor variations to fill out a whole song. Coltrane is known for his avant-garde composition, and even he repeats (often on a much smaller scale than a pop tune).<p>- The work of being a musician is repetitive. Learning (memorizing) songs takes reps! Then you've got to keep them fresh, teach them to new band members, etc. You probably have a limited book, and you know what the crowd pleasers are. Unless you're big enough to have a following cutting a song you're sick of isn't a problem, but filling out a set might be. Between rehearsal, gigs and practicing at home I probably play through most of my band's book at least twice a week.<p>- Being a musician is very physical, which means you're drilling exercises in your daily routine. As a brass player, I run more or less the same set of warmups, range builders and flexibility exercises every day. Drummers do rudiments. String players have their own shtick.<p>As far as listening to music, I don't typically put something on repeat unless I'm trying to transcribe it. But I'll listen to a song, and there's a chance it'll play on repeat in my head all day (or all week!). Steely Dan and LCD Soundsystem are particular earworms for me. It wasn't until college I realized this isn't true for many people.