Indexical

Engaging in radical and unfamiliar artistic work

https://linktr.ee/indexical Indexical is a composer-run organization dedicated to experimental music.

Indexical produces record releases, concert series, and publications. Indexical is dedicated to supporting music by composers who work outside of mainstream contemporary music institutions.

04/28/2026

This Week! Apmonia String Quartet perform a series of contemporary experimental music works at Radius Gallery. Morton Feldman's Three Pieces for String Quartet (1956) present us with an interplay of plucked and sustained tones, creating a tapestry of interconnected sonic worlds. Rarely performed, Tony Conrad's microtonal piece Minor (1995), exhibits his characteristic drifting sustained tones as it explores unorthodox minor harmonies. Chiyoko Szlavnics' Gradients of Detail (2021), utilizes a graphic score to produce fluttering moire-like glissandi. Finally, Anthony Braxton's Composition No. 17 (1971) utilizes the composer's "Language Music" system, a symbolic notation allowing for performer interpretation.

📅 Sat., May 2, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Radius Gallery, 1050 River St #127, Santa Cruz, CA
🎟 at indexical.org

Apmonia String Quartet is a freshly formed group featuring .art and Sabrina Salamone on violins, on viola, and .j.borden on cello. Based in NYC, the group’s ethos hinges on a rigorous commitment to both interpretation and improvisation in contemporary experimental music. With longstanding individual commitments to a wide array of practices across the spectrum of contemporary music, this group is excited to bring their collective experience to bear in future collaborations and program curation.

04/23/2026

TOMORROW: Indexical returns to Radius Gallery! 🌙

Indexical presents MOONS — an all-female ensemble exploring improvisation, graphic scores, and alternate tunings.

📅 Fri., April 24, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Radius Gallery, 1050 River St #127, Santa Cruz, CA
🎟 Tickets at indexical.org

Laura Cetilia, a daughter of a mixed heritage Mexican-American musician is at home with in-betweenness, straddling multiple worlds as cellist / composer / educator / artist while working within acoustic / electronic / traditional / experimental sound practices. Her compositions have been described as “unorthodox loveliness” (Boston Globe) and hailed as “alternately penetrating and atmospheric” (Sequenza 21).

Katie Porter is a Brooklyn-based clarinetist, performer/composer, writer, and artist. Her projects include collaborations across the US and Europe with: Lucio Capece, Christine Tavolacci, Bob Bellrue, Devin Maxwell, James Ilgenfritz, Lucie Vitkova, Teerapat Parnmonkol, and Anne Penders.

Christine Tavolacci is a Los Angeles based flutist specializing in contemporary and experimental music. Currently, she is active as a soloist, improviser, curator and chamber musician both in California and internationally. She is co-founder and co-director of Southland Ensemble, and has been a frequent performer in the Monday Evening Concerts series in Los Angeles, the world’s longest-running series devoted to contemporary music.

Judith Berkson is a mezzo-soprano, pianist and composer living in Los Angeles, California. She has collaborated with Kronos Quartet, Wet Ink, Yarn/Wire and City Opera and has presented work at Picasso Museum Malaga, Roulette, Le Poison Rouge, Joe’s Pub, The Stone, Barbes, Bang On A Can, and the 92 Street Y.

04/20/2026

Indexical is proud to present the quartet MOONS at Radius Gallery as part of the Ripple Effect Arts Festival!

Comprised of composer/performers Judith Berkson (accordion/voice), Laura Cetilia (cello), Katie Porter (clarinet/bass clarinet), and Christine Tavolacci (flutes), the ensemble perform original works exploring alternate tunings, improvisation, and drifting tones.

Ripple Effect Arts Festival is a countywide celebration of creativity taking place April 16-26, 2026

📅 Fri., April 24, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Radius Gallery, 1050 River St #127, Santa Cruz, CA
🎟 Tickets at indexical.org

04/17/2026

Indexical is pleased to announce a new partnership with to present a solo performance and talk by Cabrillo Festival of Contemporary Music Creative Lab commissioned artist Sarah Hennies.

📅 Mon., Jul. 27, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Indexical, 1050 River st #119, Santa Cruz, CA

In this intimate program, Hennies performs on a set of German cowbells (almglocken), gifted to her by percussionist Michael Ranta from his Cologne shop, Asian Sound. The concert will be followed by a conversation with the artist to discuss her upcoming premiere at the Festival.

Sarah Hennies (b. 1979, Louisville, KY) is a composer based in Upstate NY whose work is concerned with a variety of musical, sociopolitical, and psychological issues including including q***r & trans identity, psychoacoustics, and the social and neurological conditions underlying creative thought. She is primarily a composer of acoustic ensemble music, but is also active in improvisation, film, and performance art. She presents her work internationally as both a composer and percussionist.

04/14/2026

SATURDAY: NY experimentalists and perform their minimalist work "Skylighght," constructed upon interlaced vibration, resonance and acoustic environment. Bay Area interdisciplinary ensemble .sfba share the evening.

📅 Sat, April 18, 2026
🕗 Doors at 8pm | Show at 8:30 pm
📍 Indexical, 1050 River St #119, Santa Cruz, CA
🎟 at indexical.org

04/09/2026

MOONS, the quartet of Judith Berkson, Laura Cetilia, Katie Porter, and Christine Tavolacci present an evening-length program at Radius Gallery on Friday, April 24. The ensemble performs it's own music, coalescing around alternate tunings, drifting tones, and intuitive timing.

📅 Fri., April 24, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Radius Gallery, 1050 River St #127, Santa Cruz, CA
🎟 at indexical.org

04/07/2026

Saturday, April 18, Indexical is pleased to welcome .sfba !

Thingamajigs Performance Group break new ground in durational performance, alternate tuning, group and open compositional formats, interdisciplinary and inter-cultural collaboration, and site work. Their fields of institutional study, performance practice, and instrumentation are directly informed by Japanese noh and gagaku, Korean pansori, sijo,and sinawi, formal training in both Western and Eastern art practices, and a commitment to experimental art.

Dylan Bolles, reeds and stones
Rae Diamond, voice and small objects
Keith Evans, performative projection, turntables (with amp)
Wayne Grim, contrabass
Suki O'Kane, percussion, sampling electronics (with amp)
Edward Schocker, reeds and glass

📅 Sat. Apr 18, 8pm
🎟 Tickets at: indexical.org

04/06/2026

We are delighted to welcome Apmonia String Quartet performing performing Tony Conrad, Morton Feldman, Chiyoko Szlavnics, and Anthony Braxton.

Apmonia String Quartet is a freshly formed group featuring .art and Sabrina Salamone on violins, on viola, and .j.borden on cello. Based in NYC, the group’s ethos hinges on a rigorous commitment to both interpretation and improvisation in contemporary experimental music. With longstanding individual commitments to a wide array of practices across the spectrum of contemporary music, this group is excited to bring their collective experience to bear in future collaborations and program curation.

Program
Three Pieces for String Quartet (1956) by Morton Feldman (1926-1987)
Minor (1995) by Tony Conrad (1940-2016)
Gradients of Detail (2021) by Chiyoko Szlavnics (b.1967)
No.17 for String Quartet (1971) by Anthony Braxton (b.1945)

📅 Sat., May 2, 2026
🕗 Doors at 6:30pm | Show at 7pm
📍 Radius Gallery, 1050 River St #127, Santa Cruz, CA
🎟 at indexical.org

04/03/2026

JUST ANNOUNCED: Indexical and SC Synth Co-op present a screening of Free Party: A Folk History at on May 8!

Free Party: A Folk History follows the inception of the free party movement, a meeting between ravers and the new age travellers during Thatcher's last days in power, and the explosive years that followed, leading up the infamous Castlemorton free festival in 1992 - the largest ever illegal rave, which provoked the drastic change of the laws of trespass with the notorious introduction of the Criminal Justice Act in 1994.

🎥 Friday, May 8, 7pm
🎟 FREE to attend! RSVP at indexical.org

04/02/2026

🔥🔥🔥 Tomorrow, Apr 3 at Indexical 🔥🔥🔥

CONTAINER
Scuzzed up electronics and pulverising rhythms courtesy of Ren Schofield

FALLEN MATTER
Ice cold synthesis and glitched-out post-club apparitions

REVERB CANOPY
Fog-drenched ambience, smeared loops and enveloping texturescanopy

📆 Fri., Apr. 3, 2026
🕣 Doors at 8pm | Show at 8:30pm
🎟 Tickets: indexical.org

03/31/2026

Save the date!!! April 18, vocalist Gelsey Bell and saxophonist Erin Rogers present their duo project Skylighght. Composed collaboratively in 2019, Skylighght cultivates a minimalist music constructed upon the organic acoustic vibrations of interlaced resonances and a mutual performer sensitivity.

📅 Sat. Apr 18, 8pm
🎟 Tickets at: indexical.org

Gelsey Bell (she/they) is a Brooklyn-based multidisciplinary performance creator, composer, and vocalist. Her works often center the voice and range from song cycles and sound walks to collaboratively created operas and structures for improvisation.

Erin Rogers is a saxophonist, composer, and improviser dedicated to new and experimental music. Her work ranges from chamber music to solo improvisation to individual and collaborative compositions that incorporate live electronics and theatre.

Address

1050 River Street #119
Santa Cruz, CA
95060

Opening Hours

1pm - 5pm

Website

http://www.indexical.org/

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