Marie-Claire Schlameus, aka mcchaos, is a classically trained cellist and singer based in Berlin and Helsinki. She explores the full percussive and lyrical range of her instrument and voice to create music. In addition to working as an arranger for bands, films, dance, and theatrical productions, she is a founder and core member of the project toechter, and sometimes with others.

Since 2022, she has been a member of the new live bands of Danish artist Agnes Obel and German rapper Casper, contributing vocals, cello, loop station, and synth. She has performed with artists such as Sigur Rós, Gyða Valtýsdóttir, Bright Eyes, Thundercat, The Cinematic Orchestra, Manu Delago, and Miguel Atwood-Ferguson. MC has performed at shows and festivals across Europe, the United States, Australia, and New Zealand. In the studio, she has collaborated with artists such as Agnes Obel, Swans, Ólafur Arnalds, and Tricky. Recently, she was invited to create music in the style of Poor Things (Jerskin Fendrix), using her cello and vocals in Ableton, for the renowned German TV series Tatort.

MC studied violoncello and chamber music at the University of Music and Theatre Leipzig. She writes and produces from her home studio and at a collaborative studio space near Funkhaus. With an intuitive approach, she effortlessly navigates a wide range of musical genres, making each piece uniquely her own.

As a composer, she is signed to Random Musick Berlin