Register for HDpiano:. The majority of pop music remains in 4/4 time, but not all of it. I have actually listened to each of the 40 best selling tunes (on the United States Signboard chart) from each year of the 21st century and remembered of which time signature( s) they use. So that's a sample size of 933 tunes (it would be 960 however in some cases the same song remains in the top…