The Xenharmonic Movement just published its mission statement — and it’s worth reading
A quietly significant document appeared on the Xenharmonic Wiki in September 2025. Titled History and Philosophy of Xenharmonic Music, it was written by Nick Vuci — a Toronto-based composer and long-time member of the xenharmonic community — and co-signed by ten prominent figures from across the Xenharmonic Alliance’s online spaces. It reads, in effect, as a mission statement for the xenharmonic movement: a careful, historically grounded account of what xenharmonic music actually is, where it came from, and why that definition matters enough to write down.
The document is not a manifesto of grievances, nor is it a dry academic paper. It’s something rarer: a genuine attempt by a community to articulate its own identity, with both rigor and warmth.
What Is Xenharmonic Music, Anyway?
The document opens by acknowledging a real problem. Ask most people what “xenharmonic music” means, and they’ll tell you it’s music that isn’t in 12-tone equal temperament (12-EDO) — the standard tuning system baked into virtually every piano, guitar, and synthesizer in the Western world. That definition is, as Vuci puts it, “broadly accurate and useful as a starting point.” But it also invites a thicket of follow-up questions. Does it include medieval church music? Indian classical music? A badly out-of-tune piano? If something stops sounding strange once you’ve heard it enough times, does it stop being xenharmonic?
These aren’t pedantic quibbles. They cut to the heart of what the community is actually doing and why.
Vuci’s answer draws heavily on the writings of Ivor Darreg, the American composer and instrument builder who coined the term “xenharmonic” and founded the Xenharmonic Alliance in the latter half of the 20th century. In a 1988 document called Defining One’s Terms, Darreg wrote that a tuning is xenharmonic if most musically-inclined listeners hear it as distinct from a performance in standard 12-tone equal temperament. Crucially, this is not merely a mathematical definition — it’s a perceptual one. A tuning system that’s technically different from 12-EDO but indistinguishable to the ear doesn’t qualify. As Darreg himself put it, such systems “will not help any composers to produce really new melodies and harmonies.”
The document’s TL;DR crystallizes the position neatly: xenharmonic music clearly falls outside 12-tone equal temperament, but it isn’t simply traditional non-Western music either. It explores entirely new tonal structures beyond established frameworks. It is not synonymous with “microtonal,” it doesn’t just mean “weird music,” and it’s not a relative term that shifts depending on the listener’s cultural background. It is a specific, historically coherent tradition with a lineage, a community, and a purpose.
The History Behind the Term
A substantial portion of the document is dedicated to tracing how xenharmonic music became possible — not just theoretically, but practically. Vuci identifies three converging forces.
The first was the total standardization of 12-EDO across Western music by the late 19th century, which paradoxically created the conditions for its own critique. Hermann von Helmholtz’s On the Sensations of Tone, expanded into English by Alexander John Ellis — who also introduced the cent as a unit for comparing tuning systems — gave musicians and theorists the tools to start asking what 12-EDO was leaving out.
The second was the broader 20th-century shift away from tonal tradition. Atonality, serialism, minimalism, and electronic music didn’t directly challenge 12-EDO’s tuning, but they collectively normalized experimentation and made the questioning of fundamental musical assumptions feel less like heresy.
The third was technology: affordable power tools for building instruments, cassette culture for distributing recordings cheaply, photocopiers for sharing written theory, and eventually the internet. The xenharmonic movement was always, in a meaningful sense, a DIY and mail-order movement before it was an online one.
The Founders
The document profiles four figures it regards as foundational.
Harry Partch — the mid-century American composer who rejected 12-EDO entirely, built his own instruments, and developed an extended just intonation system that made heavy use of the 11th harmonic — is described as the movement’s wellspring. Partch formalized concepts like harmonic limits, the tonality diamond, and extended overtonal and undertonal organization that remain foundational to xenharmonic theory. As guitarist and Partch curator John Schneider is quoted saying: “All roads of American microtonal music lead back to Partch.” His influence extended directly to Ben Johnston, Lou Harrison, and Terry Riley (via La Monte Young), among many others.
Erv Wilson, deeply influenced by Partch, took a more systematic approach — gathering the conceptual fragments Partch had scattered and extending them into broader theoretical frameworks. He even drew illustrations for the second edition of Partch’s Genesis of a Music. Much of Wilson’s work circulated through personal correspondence and mail networks, an early infrastructure that would eventually evolve into the Xenharmonic Alliance. His legacy continues through collaborators including Kraig Grady, who maintains the Erv Wilson Archive; Terumi Narushima, his wife and the author of Microtonality and the Tuning Systems of Erv Wilson; and Marcus Hobbs, creator of the Wilsonic app.
George Secor is credited with inventing the first novel xenharmonic temperament — a system that accurately realizes the core of Partch’s tonal framework — and whose rediscovery in the 1990s sparked the development of Regular Temperament Theory (RTT), which the Xenharmonic Wiki was originally built to document. Secor also co-developed the Sagittal microtonal notation system and owned a generalized keyboard version of the Motorola Scalatron, one of the earliest practical electronic instruments for xenharmonic music.
Ivor Darreg, finally, is credited not primarily with theoretical innovation but with something arguably more important: community-building. He connected like-minded individuals, cultivated a space for the practice to grow, and — perhaps most lastingly — coined the word “xenharmonic” itself and organized the Xenharmonic Alliance. The document quotes extensively from his late writings, including the 1988 Annual Report and the document Defining One’s Terms, as well as his magnum opus Opening the Door to the 90’s, written when Darreg was around 73, in which he celebrated the maturation of the movement he had helped bring into existence.
The Signatories
The document was co-signed on September 24, 2025 by ten members of the Xenharmonic Alliance community:
Adam Freese (known online as anomaly on the XA Discord and schrodingasdawg on the Xen Wiki) is a composer whose output is primarily microtonal and xenharmonic. A prolific contributor to the Xenharmonic Wiki and Discord community, his music can be found on his YouTube channel and on MuseScore, where he has published scores including works for retuned piano.
Xenoindex is the owner and administrator of the Xenharmonic Alliance Discord server, one of the central hubs for the living xenharmonic community. As the person responsible for maintaining the most active daily gathering place for xenharmonic musicians, theorists, and instrument builders, Xenoindex’s co-signature carries particular weight as a representative endorsement from the community’s heart.
Gordon Wery is a member of the Xenharmonic Alliance community and a co-signer of the document, lending his voice to the collective endorsement of its historical and definitional framework.
Frédéric Gagné (known as Fredg999) is a sysop of the Xenharmonic Wiki based in Repentigny, Quebec. He first encountered xenharmonic music in 2015 through the music of the Russian composer Ivan Wyschnegradsky, regained active interest in 2018 after discovering the music of Sevish, and has since become a casual composer, a dedicated wiki editor, and a moderator on the XA Discord. As a sysop, his editorial role on the wiki makes his co-signature something of an institutional endorsement of the document.
Kite Giedraitis (known as TallKite) is a musician, theorist, instrument builder, and software developer, and one of the more practically influential figures in contemporary xenharmonics. He invented the Kite Guitar, a 7-string instrument designed around every other note of 41-EDO — making a notoriously difficult equal temperament genuinely playable. He developed Kite’s color notation and ups-and-downs notation, widely-used systems for naming and notating just intonationintervals and EDO pitches. He also wrote alt-tuner, software enabling dynamic adaptive retuning via MIDI. Outside of xenharmonics, Giedraitis plays and teaches African marimba music through his Portland-based ensemble Fools in Paradise.
Sintel is an active member of the Xenharmonic Alliance Discord community and a contributor to the ongoing conversation about tuning theory and xenharmonic practice.
hkm is likewise an active participant in the Xenharmonic Alliance’s online communities and a contributor to xenharmonic discourse.
Domin is a member of the Xenharmonic Alliance community whose co-signature reflects continued grassroots engagement with the movement’s evolving identity.
Budjarn Lambeth is a young musician and microtonalist from Australia — making his signature a notable instance of the movement’s international reach. A self-described amateur hobbyist, Lambeth produces music primarily using ThumbJam on iPad and has released a body of microtonal improvisations spanning tunings from 22-EDO to 31-EDO and beyond. He has also published a substantial collection of Scala scale files to the Internet Archive, freely available for other composers. His presence among the signatories underscores that the xenharmonic movement is not limited to established theorists or professional musicians — it welcomes anyone willing to seriously engage with tuning beyond 12.
Jacob Barton is a multi-instrumentalist, composer, and designer based in New York who has been a central organizing figure in the xenharmonic world for two decades. He studied composition at Rice University, where he received a BMI Student Composer Award for Xenharmonic Variations on a Theme by Mozart. He is the inventor of the udderbot — a unique slide woodwind instrument built from a glass bottle, a rubber glove, and water, with a range exceeding that of the concert flute — and has performed it in traditional bands, experimental venues, New York City subway stations, and humanitarian missions in Ecuador. He founded and runs UnTwelve, a Midwest-based organization dedicated to commissioning, performing, and promoting xenharmonic music, and was instrumental in establishing the Xenharmonic Praxis Summer Camp. Barton also founded the original Xenharmonic Wiki in 2005 on Wikispaces, which eventually migrated to its current home at en.xen.wiki.
Why It Matters
Reading Darreg’s original 1988 writings, quoted extensively throughout the document, it’s striking how many of the same questions he was grappling with then are still live today. What counts as xenharmonic? Does a slightly retuned piano qualify? What about drop-D guitar? (Darreg’s answer: no, and no.) The fact that a community in 2025 felt the need to revisit and formally articulate these boundaries says something both about how much the field has grown and about the perennial challenge of defining any artistic movement.
The document closes with a call to arms that would have felt at home in Darreg’s own writing: “Tuning is not just a technical detail — it is a declaration of artistic freedom.” And its final line — Detwelvulate — and long live the Xenharmonic Alliance! — is pure Darreg in spirit: irreverent, passionate, and a little bit defiant.
For anyone curious about what’s happening beyond the twelve notes, this document is an excellent place to start.
The full document, “History and Philosophy of Xenharmonic Music,” is available on the Xenharmonic Wiki. Nick Vuci’s music can be found on Bandcamp, Spotify, and other streaming platforms.
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