Original sentence: Prior to the explosion of rock and roll in the 1950s, Canada produced a number of notable international recording artists who appeared on the Billboards record sales chart called Hit parade.The Billboard charts were the  first published Music Popularity charts released in  1936
Edited sentence: Prior to the explosion of rock and roll in the 1950s, Canada produced a number of notable international recording artists who appeared on the Billboards record sales chart called Hit parade first published in  1936