When Chicago Turned Tanglewood Into a Rock Cathedral
On July 21, 1970, the American rock band Chicago delivered a remarkable live performance at the famed Tanglewood Music Center in Lenox, Massachusetts. Among the highlights of the evening was a fiery rendition of their now legendary song 25 or 6 to 4, a track that had already begun to establish itself as one of the most powerful statements in early seventies rock.
The performance took place during a formative moment in the band’s career. Chicago had released their debut double album Chicago Transit Authority the previous year, introducing a bold sound that fused rock instrumentation with a full brass section. At a time when most rock groups relied solely on guitars and keyboards, Chicago expanded the sonic palette with trombone, trumpet, and woodwinds, creating a style that felt both sophisticated and explosive.
At Tanglewood, that approach came alive in dramatic fashion. The band’s lineup that night featured keyboardist and vocalist Robert Lamm, guitarist Terry Kath, bassist Peter Cetera, trombonist James Pankow, trumpeter Lee Loughnane, multi instrumentalist Walter Parazaider, and drummer Daniel Seraphine. Together they formed a tightly coordinated ensemble whose arrangements balanced musical complexity with raw energy.
The centerpiece of the performance was the commanding presence of Terry Kath. Widely admired by fellow musicians, Kath delivered a guitar solo during “25 or 6 to 4” that remains one of the defining moments in the band’s early live history. His tone was thick and expressive, cutting through the powerful horn section while maintaining a sense of melodic control. Many rock historians have since cited Kath as one of the most underrated guitarists of his era.
Equally important was the precision of Chicago’s horn section. James Pankow’s trombone arrangements, combined with Lee Loughnane’s trumpet and Walter Parazaider’s woodwinds, created a layered sound that pushed the song beyond traditional rock structure. Their parts moved with the discipline of a jazz ensemble yet carried the force of arena rock.
“25 or 6 to 4,” written by Robert Lamm, had already become one of Chicago’s most recognizable compositions. The song would later reach number four on the Billboard Hot 100 in 1970, helping solidify the band’s national presence. Its driving rhythm, urgent keyboard riff, and dynamic brass lines made it perfectly suited to the concert stage.
The Tanglewood performance captured Chicago at a moment when their identity was still taking shape but their ambition was unmistakable. In an outdoor venue better known for classical music, the band demonstrated that sophisticated horn driven rock could command the same respect and excitement as any traditional symphonic performance.
More than five decades later, this live recording remains a vivid document of Chicago’s early power. It reveals a band not only performing a hit song, but defining an entirely new sound within American rock music. 🎶