


In the U.K., the British Phonographic Society's parental advisory board recommends that a song be identified as explicit when it contains swearing, references to sex, racism or homophobia, references to dangerous or criminal behaviour, and references to mental health. Artists must tag whether a song is considered explicit or not when it is uploaded and Spotify's website says it makes both the clean and explicit versions available. The study, Exploring Six Decades of Billboard 100 Number One Singles, by data analyst Mark Bannister, defines explicit songs based on Spotify's labeling.

Given the content of some 2012 hits, such as Flo Rida's " Whistle " (it begins: Can you blow my whistle baby) and "Locked Out of Heaven" by Bruno Mars in 2012, (lyrics include "' cause your sex takes me to paradise ") songs were certainly suggestive, if not profane. With only one exception (2012), there hasn't been a year since 2001 without at least one number one single carrying a parental advisory label (and in every other year there have been at least 10 examples). Data shows that up till 2001, only five songs with explicit lyrics made it to number one, but since then, explicit chart toppers have rocketed by 833 percent. Our taste for expletive-filled lyrics and has grown hugely since the Billboard 100 started in 1958. More than two thirds of Billboard 100 number one songs that charted in 2017 feature explicit lyrics, a new study shows based on Spotify API data.
