It didn't take long for Chicago IX: Chicago's Greatest Hits to hit #1. Released November 10, 1975, the album was clearly a popular gift to give around the holidays that year, at it soared to to the top spot on December 13 of that year, where it stayed for more than a month.
The collection rounds up tracks from the band's albums ranging from 1969 debut, Chicago Transit Authority, through Chicago VII (1975). Chicago VIII tunes were skipped, as the album had just come out earlier that same year. Chicago III is not represented, as none of the songs were considered big enough hits to be included.
The album's popularity persisted well beyond the holiday season, with the collection spending an impressive 72 weeks on the Billboard 200. Chicago IX: Chicago's Greatest Hits has sold more than five million copies to date.