Yakov Vorobyev, who invented a popular app for DJs called Mixed in Key, used the program to analyze the 25 most-streamed tracks on Spotify in 2012 and 2017: He found that during that period, the average tempo dropped by 23 bpm (to 90.5 bpm) and the percentage of songs above 120 bpm fell markedly from 56 percent to 12.5 percent.
Part of the slowing is due to the continuing dominance of hip-hop, which now permeates every branch of music, even longtime holdouts like rock and country. "Hip-hop culture is the new pop culture, and our tempo ranges aren't too fast," says Sevn Thomas, who helped produce Rihanna's Number One smash "Work." "Rappers can really swag out on slower beats."
But maybe there are other reasons as well: Pop culture's insatiable appetite for the new demands a backlash against fast-moving singles, or a gloomy national moment encourages a different sort of listening. ...
[Radio business veteran Sean] Ross worries about the dearth of uptempo singles – if there's nothing modern to balance out playlists, in his view, programmers turn to older tracks for a jolt of speed, further reducing the already limited variety on the airwaves. "Top 40 has become tighter than any time in the last 35 years in terms of the actual number of titles," he notes. "If you combine that with the time records spend on the charts now, there aren't a lot of chances for songs to come along and break the logjam. ... I've had conversations with programmers in every format, and usually the solution is to play even less new music, which ends up reducing the chance the next uptempo record is going to get through."
--Elias Leight, Rolling Stone, on an era that is hard to dance to. HT: Marginal Revolution