Cliff Notes version: Why so many long-running #1s in the past quarter century, and so few before then?
TLDR:
Some background: When Casey Kasem used to do the American Top 40, we would refer to the ‘Rock Era’ as starting mid 1955, when Bill Haley and His Comets hit #1 with “Rock around the Clock.” So, everything that follows is “Rock Era” and later (as most of the songs for many years could hardly be called “Rock”.) Anyway. . .
There have been 28 songs since then that have held #1 for 10 weeks or more. In the first 21 years of the “Rock Era,” there were. . . Zero.
Then, Debby Boone held #1 for weeks with “You Light up My Life” in 1977.
Four years later, Olivia Newton-John held #1 for weeks with "Physical.’
11 years after that, Boyz II Men joined an all-time four-way tie when they held #1 for 13 weeks with 'End of the Road" [the previous tie being between “Frenesi” by Artie Shaw (1940), " I’ve Heard That Song Before" by Harry James (1943), and “Goodnight, Irene” by The Weavers (1950)]
And the long runners kept a-comin’ after that. In the 1990s, a total of 11 songs held #1 for 10 or more weeks.
In the 2000s, there were 12.
Then the pace cooled. So far in the five years of the 2010s, there have been only three–but that’s still more than the first 26 years of the Rock Era.
So. . . with all that background, why so many in the past quarter century, and so few in the 36 previous years?
Link. Boyz II Men shows up three times in the list.