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Chicago’s iconic hit “25 or 6 to 4” marked a major turning point for the band, propelling them into the spotlight with one of their earliest chart successes. Released in 1970 on their self-titled album, the song became Chicago’s first to reach the top 5 on the Billboard Hot 100, setting the stage for a string of hits that would define their career.
Robert Lamm, a founding member of the band, shared insights into the song’s creation during a 2019 interview. He recalled writing the track late one night, sitting cross-legged on the floor with a 12-string guitar that was missing two strings. The song emerged from a riff he played alongside a melody he sang, which he later expanded on the piano to include the signature horn arrangements that became a hallmark of Chicago’s sound.
The cryptic title and lyrics have sparked fan theories for decades. Lamm explained that the song was essentially a snapshot of the songwriting process itself, written in the early hours while gazing out over the Hollywood Hills. The phrase “25 or 6 to 4” refers to the time-around 3:35 or 3:34 a.m.-noting how he struggled to read the antique clock’s hands as he worked.
Shortly after the song was introduced to the band, the members faced an unexpected setback. During a Dodgers-Cubs game at Dodger Stadium, Peter Cetera, the band’s bassist and vocalist, got into an altercation with some Dodgers fans, resulting in a broken jaw wired shut for several months.
This injury coincided with the recording of “25 or 6 to 4,” forcing Cetera to adapt his singing style. Producer Jimmy Guercio recalled encouraging Cetera despite the challenge, confident the song would succeed.
Indeed, Cetera’s performance remained strong, and the track has since become a staple of classic rock radio. Billboard ranked “25 or 6 to 4” as Chicago’s greatest song, praising its fusion of rock, soul, and brass that has resonated with audiences for over half a century. The song remains a concert favorite and a popular choice for marching bands nationwide.
Interestingly, even after Cetera’s jaw healed, he continued to sing with a more restrained mouth movement, fearing his jaw might reopen unexpectedly. His distinctive vocal approach, combined with Terry Kath’s powerful guitar work and the band’s dynamic horn section, helped cement “25 or 6 to 4” as a timeless classic in Chicago’s extensive catalog.