Plus, former Chicago singer Bill Champlin looks back at "Look Away" in the first of a two-part episode.
Welcome to the Billboard Chart Beat Podcast, where each week co-hosts Gary Trust and Trevor Anderson, from the Billboard charts department, discuss why what's on the charts … is on the charts, while also looking at current chart action in a historical context for even greater insights.
This week, Gary and Trevor begin a two-part look back at every year-end Billboard Hot 100 No. 1, beginning with the chart's launch in 1958, as we cover smashes from The Beatles, Paul McCartney (solo), Rod Stewart, Blondie, Prince and more. Plus, special guest Bill Champlin, who sang some of Chicago's biggest hits from 1981 through 2009, stops by to reminisce about the No. 1 song of all of 1989, "Look Away."