Some of the most enduring music ever recorded was never planned. It arrived during a gap in the schedule, when musicians had a little extra time and nowhere else to be. That is exactly what happened one afternoon in Memphis when a handful of session players decided to keep the tape rolling after the official work was done.

What came out of that unplanned stretch of time was not a forgotten oddity. It became one of the most recognizable instrumentals in American music history, and a cornerstone of an entire label’s identity.

The instrumental is “Green Onions” by Booker T. & the M.G.’s, recorded at Stax Records in Memphis in the summer of 1962.

The Stax Studio in a Former Cinema

To understand how “Green Onions” happened, it helps to picture where it was made. Stax Records operated out of a converted movie theater on McLemore Avenue in Memphis, Tennessee. The old Capitol Theatre had been transformed into a recording studio with a distinctive sloped floor — a leftover from the cinema’s original seating design — and walls lined with whatever acoustic materials the label could afford, including carpet remnants and old drapes.

The sound that came out of that room was not polished or clinical. It was warm, slightly raw, and deeply rooted in the neighborhood around it. Stax would go on to release records by Otis Redding, Sam & Dave, Wilson Pickett, and dozens of other artists who helped define soul music. But in the summer of 1962, the label was still a young operation finding its footing.

The house band at Stax was a tight-knit group of session musicians who could back almost anyone on short notice. They were extraordinarily capable players who had developed a chemistry from working together constantly. That chemistry was about to produce something none of them had specifically prepared for.

The session that day had originally been booked for a different recording project. When that work wrapped up ahead of schedule, there was studio time left on the clock. Rather than pack up and go home, the players stayed and started working through ideas informally. Nobody announced that they were making a record. They were simply playing.

The Four Musicians Begin to Jam

The four musicians who created “Green Onions” came from different backgrounds but fit together like a single instrument. Understanding each of their roles helps explain why the track sounds the way it does.

Booker T. Jones was the keyboard player and would later become the group’s namesake. At the time of the recording, he was still a teenager, but already a seasoned musician who had grown up in Memphis steeped in gospel, R&B, and jazz. His primary instrument that day was the Hammond organ, and the riff he produced would become the defining sound of the entire recording.

Steve Cropper played guitar. Cropper had a style that was precise without being flashy — every note counted, nothing was wasted. His rhythm and lead work on “Green Onions” sits underneath and around the organ line without ever crowding it. He would later be recognized as one of the most influential rhythm guitarists in soul and R&B history, and his work on this track is a perfect example of why.

Al Jackson Jr. was the drummer. Jackson was one of the most in-demand session drummers in Memphis, and his feel was exceptional. He played with a restraint and precision that made the groove feel locked in without ever sounding mechanical. When musicians and producers talk about the Stax rhythm-section sound, Jackson’s drumming is a central reason why that sound worked.

Lewie Steinberg played bass on the original recording. This is an important distinction: Steinberg was the bassist on “Green Onions” at the time of its release in 1962, not Donald “Duck” Dunn, who would later become the group’s more widely recognized bassist. Steinberg’s bass line on “Green Onions” is simple, solid, and perfectly in service of the groove. He holds the bottom end steady and lets the other instruments breathe above him.

Together, these four men created a rhythm section that was greater than the sum of its parts. Their informal jam that afternoon had a shape and a focus almost immediately, and the direction it took came from the keyboard.

Booker T. Jones’s Organ Riff

The Hammond organ sound at the center of “Green Onions” is one of those musical moments that is nearly impossible to hear without recognizing it. The riff Booker T. Jones played that afternoon was not a complicated composition. It was a repeating, blues-drenched melodic phrase, delivered with a tone that sat somewhere between soulful and hypnotic. The organ’s natural sustain and the slightly gritty quality of the Hammond gave the riff a texture that a piano simply could not have replicated.

Jones has spoken in interviews about the spontaneous nature of the session. The group was not working from a written arrangement. They were listening to each other and responding in real time. The organ riff gave the others something to lock onto, and the track essentially built itself from there. Cropper’s guitar found its place in the pockets of the phrase. Jackson settled into a groove that gave the whole thing forward motion without rushing it. Steinberg’s bass anchored the bottom and let the riff float.

The result was a performance that felt both effortless and inevitable. When Stax recognized what they had on tape, the decision was made to release it as a single. The track was given a title — “Green Onions” — and pressed for release.

Listen to what that afternoon produced.

The B-Side Radio Stations Preferred

Here is where the story takes a turn that feels almost too perfect. When “Green Onions” was initially released as a single in 1962, it was placed on the B-side. The label had designated another track as the main attraction. Radio DJs, however, had different ideas.

Stations began flipping the single over and playing “Green Onions” instead. The response from listeners was immediate. The track climbed the charts not because of a calculated promotional push, but because disc jockeys and their audiences recognized something in it that simply worked on the radio. The organ riff cut through, the groove was irresistible, and the track had an atmosphere that made people want to hear it again.

“Green Onions” reached number three on the Billboard Hot 100 and went all the way to number one on the R&B chart. For a label still establishing its identity and a group of session musicians who had made the track during leftover studio time, that was a remarkable outcome. The so-called B-side had become one of the biggest instrumental hits of its era.

It also confirmed something important about Stax and the musicians who worked there. The instincts of that house band were not just reliable for backing other artists. They were capable of producing something entirely their own.

Defining the Memphis Sound

“Green Onions” did more than produce a chart hit. It helped define what became known as the Memphis sound — a style of soul and R&B rooted in tight rhythm-section playing, understated arrangements, and a groove-first approach that put feel ahead of flash. Stax would refine and expand on that approach throughout the 1960s, and Booker T. & the M.G.’s remained at the center of it, both as a group in their own right and as the core of the Stax session band backing countless other artists.

The M.G.’s played on sessions for Otis Redding, Albert King, Carla Thomas, and many others, bringing the same disciplined, groove-centered philosophy to every session. The influence of “Green Onions” can be heard in decades of soul, funk, and R&B that followed, as well as in the work of rock and blues musicians who studied the Stax catalog carefully.

Booker T. & the M.G.’s were inducted into the Rock and Roll Hall of Fame in 1992, recognition that placed them alongside the artists they had spent years supporting and elevating. The induction acknowledged what anyone who had listened carefully already understood — this was not just a backing band. This was a group whose collective voice shaped an era of American music.

Steve Cropper, in particular, became one of the most respected guitarists and co-writers in soul music history, with credits extending far beyond Stax. Al Jackson Jr. is still cited by drummers as one of the essential influences on groove-based playing. And Booker T. Jones has continued to record and perform across a career that stretches more than six decades.

All of it traces back, in some sense, to that afternoon when no one had anything in particular planned. The official session was over. The studio was still warm. The musicians stayed and played. And somewhere in that casual, unscheduled stretch of time, they stumbled into a riff that would not be forgotten.

Some songs are planned carefully and still never quite land. Others arrive on a Tuesday afternoon during leftover studio time, with no blueprint and no expectations, and end up defining everything that follows. “Green Onions” is that second kind of song — and nearly sixty years later, the moment that organ riff begins, it still sounds like something that could only have happened exactly the way it did.