Chubby Checker's classic, the My Fair Lady soundtrack and The Beatles were all No. 1.

Chubby Checker performs at the IEBA 2009 Honors at Ryman Auditorium on Oct. 12, 2009, in Nashville.

Rick Diamond

Billboard’s charts and print issues have long been dated on Saturdays, but for America’s bicentennial, tradition was broken in celebration of the country’s birthday — and its rich musical history.

That week, weekly charts and the print product were dated July 4, 1976; normally they would’ve been dated July 3.