When it comes to the iconic sound of Chicago, their 1970 classic “25 or 6 to 4” stands as one of the most enduring and electrifying anthems in rock history. Featured on their landmark second album, “Chicago II,” this track swiftly became a signature masterpiece for the band, fusing brass-driven jazz rock with an irresistible guitar riff and enigmatic lyrics.
Crafted by Robert Lamm, the song soared up the charts, peaking at an impressive No. 4 on the Billboard Hot 100 in 1970, cementing Chicago’s reputation as one of the most innovative and wildly unique bands of their era.
The puzzling title, “25 or 6 to 4,” has long fueled speculation but simply denotes the time of day—either 25 or 26 minutes to 4 AM—when Lamm wrestled with finalizing the lyrics. This mysterious phrasing, however, ignited diverse theories among fans. Some speculated it hinted at drug use, while others sensed deeper, hidden messages lurking beneath. Whatever the interpretation, the song’s pounding rhythm, scorching guitar solo, and vibrant brass section made it an instant rock classic.
Musically, “25 or 6 to 4” brilliantly showcases Chicago’s distinctive fusion of rock’s grit and jazz’s sophistication. The backbone of the track is Terry Kath’s legendary guitar work, whose fuzzy, distorted solo is hailed as one of rock’s greatest of all time, injecting a raw, bluesy grit into the composition. Complementing this is Chicago’s iconic horn section, delivering a punchy, powerful counterbalance that makes the song both melodic and forceful. Alongside this, the driving bassline and relentless drum beat propel the energy, making it a mainstay on classic rock radio and a highlight of live performances.
The 2002 remaster breathes new vitality into “25 or 6 to 4,” preserving all its raw energy and explosive intensity while offering enhanced clarity and depth. This updated mix shines a light on the intricate musical details, allowing dedicated fans to fully savor the complex arrangements and masterful performances.
Decades on, “25 or 6 to 4” remains one of Chicago’s most revered and frequently performed songs. Whether it’s the catchy guitar riff, commanding brass power, or the enigmatic lyrics that stir curiosity, this anthem continues to captivate rock lovers across all generations. As a rock anthem that has withstood the test of time, its power and energy remain as thrilling and electrifying now as they were over fifty years ago in 1970.
“Every time I listen to ’25 or 6 to 4,’ I’m drawn back to that raw, passionate energy that only pure rock can deliver,” says longtime fan and music historian, Janet Reynolds.
Robert Lamm himself once explained, ‘I was just noting the time late at night when inspiration struck—nothing more mysterious than that. But I love how people made their own meanings out of it.’
