Mattie Barbier is an LA based musician and sonic researcher focused on experimental intonation, latent acoustic worlds, and the physical processes of their instrument. Their playing has been described by the LA Times as being "of intense, brilliant, virtuosic growling that gave the striking impression that Barbier was dismantling the instrument while playing it," by the Wire as “exploring the nooks of instrumental tone far beyond the reach of most mortals,” and by the New Yorker as being a "diabolically inventive trombonist-composer."

Mattie engages in collaborative relationships with a range of musicians including Weston Olencki, Ellen Arkbro, Clara Iannotta, Sarah Davachi, Michelle Lou,  Wolfgang von Schweinitz,  Jacob Kirkegaard, and Katherine Young. Additionally, they have performed as a soloist with the Helsinki Philharmonic, SWR Symphonieorchester, and WildUp. As an interpreter they have given premieres by and collaborated with a broad spectrum of sonic practitioners including George Lewis, Catherine Lamb, Liza Lim, Lester St. Louis, Kevin Drumm, Kaori Suzuki, Raven Chacon, Nate Wooley, and Scott Walker. 

Mattie is a member of RAGE Thormbones, wildUp, echoi, Diapason, and is an active soloist and improviser on low brass instruments and bagpipes. Additionally they teach at CalArts.

Mattie has presented and created work with and for the Museum of Jurassic Technology, Getty Center and Villa, Monday Evening Concerts, Lampo, San Francisco Exploratorium, Indexical, Los Angeles Philharmonic’s Green Umbrella Series, Bemis Center, Roulette Intermedium, RedCat, Mahler Chamber Orchestra, Ensemble Apparat, Factory Seconds Brass Trio, and Issue Project Room as well as in collaboration with holographer Tristan Duke.  They have made a wide array festival appearances including: Borealis (NO), IMD Darmstadt (DE), Donaueschinger (DE), Musica Nova Helsinki (FI),  Maerzmusik (DE), Bludenz Tage zeitgemäßer (AT), Spor (DK), Chicago’s Frequency Festival, Dartington International Summer School (UK),  Kalv Festival (SE), JAMA (SK), Minu (DK),  and the Ojai Music Festival. Mattie has held  guest residencies at Harvard, Princeton, Stanford, Columbia, NYU, UCSD, and the University of Chicago. Various recording projects as a soloist and ensemble member have been released on Sofa Music, Dinzu Artifacts, Carrier, Tripticks, Populist, Mode, Hat Hut, Innova, Late Music, Faux Amis, Ideologic Organ, New Focus, Domino, New Amsterdam, and Kairos Records.