Is an exploding market in headphone sales leading to a change in the music we listen to through those headphones? That's the fascinating theory of this piece by AMANDA PETRUSICH, who notes that the ever-increasing use of smartphones and similar devices has been accompanied by an increasing use of headphones and earbuds, which, she argues, change not only how you hear music ("a heightened sense of the stereo field," for example) but what kind of music you want to hear. Headphone listening is personal, isolationist listening, and it turns out, perhaps not surprisingly, that headphone users are statistically more likely to listen to self-empowerment anthems like KATY PERRY's "ROAR" and KANYE WEST's "STRONGER." Confessional pop like DRAKE's "VIEWS" makes sense, too, in the intimate, private world of headphone audio, she suggests. Will pop musicians and songwriters eventually start tailoring their music to this environment? Or have they already done so?... GRADO earbuds and AKG K240 headphones (preferably vintage) rule, by the way... TUESDAY was the 37th anniversary of one of the dumbest promotional stunts in the history of both pop music and sports, DISCO DEMOLITION NIGHT at COMISKEY PARK in CHICAGO. Tens of thousands of CHICAGO WHITE SOX fans rioting on the field while a similar number of disco records were burned in a giant bonfire may well have been the peak of the "disco sucks" movement. But it did not kill disco, as some amateur historians claim, and it did prove that the universe has a finely tuned sense of humor. The event forced the WHITE SOX to forfeit a game, and all but ended the career of team executive MIKE VEECK, who dreamed up the stunt. And a few years later CHICAGO gave birth to house music, which no doubt all those fans hated even more than disco... RIP VAUGHN HARPER.