Music Week are reporting that pop overtook rock in terms of album sales market share in 2011, the first time it has done so since 1999.
Figures released by the BPI show pop music's share growing from 30.9% in 2010 to 33.6% in 2011, while rock dropped from 31.2% to 29.4% over the same period.
As expected, this shift was helped by Adele's '19' and '21' albums, while only two traditional 'rock' albums made it into the end of year Top 20.
In terms of singles, pop suffered a slight decline (from 38.3% to 36%), while rock rose from 17.2% to 18%, so who knows what that all means.
The whole thing is a bit confusing really because the artists assigned to each genre are a bit random, but there you go.