45 years ago this week, Rush released the most successful album of their entire stellar career, featuring classics like Tom Sawyer, Limelight and YYZ. For it, they embraced the musical sensibilities of the era, with the rise of the New Wave movement, and made their arrangements tighter and more focused. The result was a number 1 album in Canada, and top 5 in the U.S.& U.K., Randy Renaud revisits the story behind it on this week's edition of the Chronicles of Rock.