A composer, performer and organiser originally from Yorkshire, he currently lives and works in Copenhagen. He often works at an intersection between music for instruments and voices, electronic sound, text, video, and performance. His music regularly engages with are contextualisation of everyday sounds, objects, and automatic, repetitive behaviours to reveal the latently musical in the banal and familiar. In recent years, a number of his works have centred on audience participation and interactivity.

He graduated from the Royal Conservatoire of Scotland in 2018, where he studied composition with David Fennessy. He continued his education at the Royal Academy of Music, Aarhus, where he studied with Niels Rønsholdt, Juliana Hodkinsonm, and Simon Steen-Andersen.

Recent commissions have come from Klang Festival, Aarhus Chamber Orchestra, SPOR Festival (for Duo Van Vliet), Riot Ensemble / Huddersfield Contemporary Music Festival (for percussionist Sam Wilson), The Night With… (for The Hermes Experiment), Hebrides Ensemble / Edinburgh Book Festival, The Cumnock Tryst, Cryptic Glasgow, and Sasha Savaloni (guitarist) / Current Resonance.

His music has been programmed at festivals such as SPOR, Klang, Summer Courses for New Music in Darmstadt, Warsaw Autumn, Transit, Huddersfield, Matera Intermedia, and New Music Dublin. Performances and collaborations have come from artists and ensembles such as SWR Symphony Orchestra; BBC Scottish Symphony, ensemble mosaic, Curious Chamber Players, percussionist Sam Wilson (Riot Ensemble), Athelas Sinfonietta, Aarhus Sinfonietta, Hebrides Ensemble, Red Note Ensemble, The Hermes Experiment, and accordionist Andreas Borregaard. Matthew Grouse is one of four nominees for the Gaudeamus Award 2025. He has twice been nominated for an Ivor Novello Award, most recently in the 2024 Best Stage Works category, for his evening-length music-theatre work Calls to this number are being diverted. In 2018, his chamber work 10 seconds won the Dorico Award at the Scottish Awards for New Music.

 As of 2024, he teaches composition at Sankt Annæ (MGK) inCopenhagen. Since 2023, he has been the chairperson for Aarhus Unge Tonekunstnere, working to create performance opportunities for young composers and sound-artists in Aarhus.

Selected works: CONTACT, live audio/tactile/visual performance (2020), Solos and Tuttis for orchestra (2020), LEFT RIGHT, LEFT RIGHT for percussionist, video and electronics (2020), Calls to this number are being diverted, music theatre and installation (2024), ctrl+Y for four performers with QWERTY keyboards, instruments and electronics (2021), A very exciting product launch for oboe, clarinet, violin, viola, audience and interactive video (2022), Do this, do that… but not that and not quite yet for viola, accordion, electronics, video and audience (2024), En Dansk Symfoni for soloists, orchestra and electronics (2025).