Matt Orenstein is a Los Angeles-based composer, songwriter, and bassist. 

Matt got his start in the relentlessly experimental Minneapolis music scene as an adolescent in the early 2000's, the spirit of which he carried with him to Oberlin, OH. While at Oberlin Conservatory, he studied bass with Peter Dominguez (and Eddie Gomez during Dominguez's sabbatical), studied electronic music and composition, and played in as many different kinds of ensembles as he could. He spent 2011 to 2015 in Chicago, where he worked as a teacher, composer, songwriter, sound designer, and instrumentalist.

Matt's work and performances have seen favorable coverage in several publications, including The New York Times, The LA Times, Entertainment Weekly, and the Allmusic Guide. He has worked with Four Larks, Laboratory Dancers (Chicago), Le Tour, Oberlin Dance Company, Fonema Consort, High Concept Laboratories, Access Contemporary Music, Death & Pretzels,  and several other groups around the Minneapolis, Oberlin, Chicago, and Los Angeles areas.  Films with Matt's scores have screened at several film festivals around the world, including Mostra São Paulo, Prix Videoformes (Paris), Chicago Independent Film Festival, Santa Barbara International Film Festival, and SXSW.

Matt has toured the country several times under several different banners, including his ongoing project, Lionel O. So far, Lionel O has released six albums.