Original sentence: As well, it has developed a music infrastructure that includes training institutions, conservatories, performance halls and developed a national public radio system.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 first published Music Popularity charts in 1936
Edited sentence: As well, it has developed a music infrastructure that includes training institutions, conservatories, performance halls and developed  public radio in 1920.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  first published Music Popularity charts released in  1936