Music sequencer

• 1. Introduction

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  The music sequencer sits at the heart of nearly every piece of recorded music you have heard in the past four decades. Before the microchip, before the software plugin, before MIDI, the idea of telling a machine to play notes in a precise order was already centuries old. In the 9th century, the Banu Musa brothers in Persia built a steam-powered flute-playing machine described in their Book of Ingenious Devices. That device is now recognized as the first programmable music sequencer in recorded history. How did a hydraulic flute from 9th-century Persia lead to the laptop-based music studios of today? What forces, inventors, and standards shaped the sequencer into the invisible engine behind modern music production? Those are the questions this documentary will follow.

• 2. Ancient Machines and Mechanical Predecessors

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  Al-Jazari, an Arab engineer, built a robot band in 1206 that could perform more than fifty facial and body actions during each musical selection. Among its four automaton musicians were two drummers. The percussion was controlled by pegs, or cams, that bumped into small levers; moving the pegs around changed the rhythm and the drum pattern entirely. Scholars now consider it the first programmable drum machine. Centuries before electronics or electricity, the sequencer was already a mechanical reality.

  In the 14th century, rotating cylinders fitted with pins were used to play a carillon in Flanders. Barrel organs followed in the Netherlands by at least the 15th century. The logic was consistent across all these devices: encode a musical sequence into a physical object, and let the mechanism do the performing.

  The late-18th and early-19th centuries brought a wider proliferation. Music boxes, barrel pianos, mechanical organs, and orchestrions all used pins on cylinders or holes punched into flat metal discs and paper rolls to trigger notes. These instruments spread as popular entertainment before the phonograph, radio, and sound film gradually displaced them. Punched-paper-tape media, in one form or another, remained in use until the mid-20th century. The earliest programmable music synthesizers, including the RCA Mark II Sound Synthesizer in 1957 and the Siemens Synthesizer in 1959, were still controlled via punch tapes closely related to piano rolls.

• 3. Raymond Scott and the Electronic Frontier

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  Raymond Scott, an American composer of electronic music, spent the 1940s through the 1960s inventing a series of devices that would define the electronic sequencer's early character. During the 1940s and 1950s, Scott built what he called the Wall of Sound, an electro-mechanical sequencer that covered an entire wall of his New York studio. It produced rhythmic patterns using stepping relays borrowed from dial-pulse telephone exchanges, solenoids, control switches, and tone circuits built around 16 individual oscillators. Robert Moog later described its operation: the whole room would go clack, clack, clack, and the sounds would come out all over the place.

  Scott did not stop there. In 1959 he completed the Circle Machine, which arranged incandescent bulbs, each with its own rheostat, in a ring. A rotating arm carried a photocell that scanned over the ring. The brightness of each bulb shaped both the waveform being generated and the speed of the arm's rotation, producing arbitrary rhythms from a purely optical mechanism. Scott also created the Clavivox, under development since 1952. Its prototype incorporated a theremin built by a young Robert Moog to enable portamento across a three-octave range. A later version replaced that theremin with a pair of photographic film and a photocell that controlled pitch by voltage.

  Scott is credited as the inventor of the first electronic sequencer, using thyratrons and relays. His work showed that a sequencer did not have to be mechanical or punch-tape-driven; it could be an electronic circuit that encoded musical time directly into voltage and pulse.

• 4. Computer Music Takes Shape

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  In June 1951, the computer CSIRAC, Australia's first digital computer, played Colonel Bogey, the first piece of computer music on record. Five years later, Lejaren Hiller at the University of Illinois at Urbana-Champaign wrote one of the earliest programs for computer music composition on ILLIAC, and collaborated with Leonard Issaction on the Illiac Suite for String Quartet. At Bell Labs in 1957, Max Mathews wrote MUSIC, the first widely used program for sound generation. A 17-second composition was performed on the IBM 704 computer that same year.

  In Japan, the story begins in 1962, when Keio University professor Sekine and Toshiba engineer Hayashi experimented with the TOSBAC computer. The result was a piece called TOSBAC Suite. Several years later, Mathews and L. Rosler built Graphic 1 in 1965, an interactive graphical sound system that let a user draw figures with a light-pen and hear them converted into sound. It paired a PDP-5 minicomputer for data input with an IBM 7094 mainframe for rendering.

  By 1970, Mathews and F. R. Moore had developed GROOVE, which stood for Generated Real-time Output Operations on Voltage-controlled Equipment. Running on 3C/Honeywell DDP-24 minicomputers, it was the first fully developed system for interactive composition and realtime performance. GROOVE used a CRT display, a 12-bit digital-to-analog converter for live sound playback, a CV/gate interface, and controllers including a musical keyboard, knobs, and rotating joysticks. The digital hardware sequencer, meanwhile, appeared commercially in 1971 when Electronic Music Studios released a module with their Synthi 100 synthesizer, followed by Oberheim's DS-2 Digital Sequencer in 1974 and Sequential Circuits' Model 800 in 1977.

• 5. Roland and the Rise of the MC-8

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  Roland Corporation released the MC-8 MicroComposer in 1977, and it changed the trajectory of electronic music production. The MC-8 was a stand-alone, microprocessor-based digital sequencer that operated on CV/gate signals. It allowed a musician to enter notes as numeric codes via a keypad. Its 16 KB of RAM could hold a maximum of 5,200 notes, which Roland described as large for the time. It supported eight-channel polyphony, meaning it could allocate multiple pitch control voltages to a single gate signal to construct polyrhythmic sequences.

  Yellow Magic Orchestra were among the MC-8's earliest known users, beginning in 1978. Their adoption pointed to where the device was heading: the MC-8 and its descendants, including the Roland MC-4 Microcomposer, exerted more influence on popular electronic music production during the 1970s and 1980s than any other sequencer family, according to the historical record.

  Elsewhere in 1977, the Synclavier I was released by New England Digital in September of that year. It was one of the earliest digital music workstations to include a multitrack sequencer. The Synclavier line evolved through the late-1970s and into the mid-1980s, eventually establishing the integration of digital audio and music sequencing with its Direct-to-Disk option in 1984 and a later Tapeless Studio system. In 1982, the Fairlight CMI Series II arrived with a new sequencer software called Page R, combining step sequencing with sample playback in a single interface.

• 6. The MIDI Standard and Its Consequences

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  In June 1981, Roland Corporation founder Ikutaro Kakehashi raised a proposal with Oberheim Electronics founder Tom Oberheim and Sequential Circuits president Dave Smith: standardize communication between instruments from different manufacturers. In October 1981, the three men extended those discussions to include representatives from Yamaha, Korg, and Kawai. The resulting standard, MIDI, was unveiled by Kakehashi and Smith in 1983.

  The first MIDI sequencer was the Roland MSQ-700, also released in 1983. Before MIDI, general-purpose computers had played only a limited role as sequencers. After MIDI, that changed entirely. Computer-based MIDI sequencers proliferated. MIDI-to-CV/gate converters allowed older analogue synthesizers, which spoke a different electrical language, to be controlled through a MIDI sequencer. Since its introduction, MIDI has remained the musical instrument industry's standard interface.

  Roland's MPU-401, released in 1984, accelerated the spread further. It was the first MIDI-equipped PC sound card capable of MIDI sound processing and sequencing. After Roland licensed MPU sound chips to other sound card manufacturers, an effectively universal MIDI-to-PC interface took hold. In Japan, the NEC PC-88 and PC-98 personal computers had already added MIDI sequencing support with Music Macro Language programming in 1982, and Roland's CMU-800 sound module brought music synthesis and sequencing to the PC, Apple II, and Commodore 64 in 1983.

• 7. Software, Trackers, and the Modern DAW

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  In 1987, a new class of software called trackers arrived, designed to deliver low-cost integration of sampled sound and interactive digital sequencing. They drew a direct line back to the Fairlight CMI II's Page R interface. Trackers became widely used through the 1980s and 1990s, particularly for composing computer game music, and they remain active in the demoscene and chiptune communities.

  Japan had foreshadowed this path in 1978, when personal computers such as the Hitachi Basic Master equipped low-bit digital-to-analog converters for sound output sequenced via Music Macro Language. That approach fed directly into the chiptune tradition that would define an entire era of video game audio.

  Modern computer audio software after the 2000s, such as Ableton Live, incorporates sequencing functions alongside recording, mixing, and synthesis. Today the word sequencer is used most often to describe software, though hardware sequencers have not disappeared. Workstation keyboards carry proprietary built-in MIDI sequencers. Drum machines and older synthesizers include step sequencers. The market for stand-alone hardware MIDI sequencers has contracted considerably because software now offers a larger feature set, but the underlying logic, encoding musical time into repeatable, editable instructions, is the same logic that moved the pins on Al-Jazari's drum machine in 1206.