Composer Leah Muir’s music has been performed by many international venues such as the Deutsche Oper Berlin, Bruckner Orchester Linz with Dennis Russell Davies and David Friedman, the Münchener Biennale, Wien Modern, MärzMusik, Academy Schloss Solitude, Wiener Konzerthaus, Konzerthaus Berlin, the Aspen Music Festival, June in Buffalo, Matera Festival, Heroines of Sound, Ars Electronica, Soundtrack Cologne, as well as many established new music ensembles and soloists. She was chosen for the Artist Residency in Venice 2019 at the Deutschen Studienzentrum. Other important residencies include a Fulbright where she studied with Chaya Czernowin at the University of Music and Performing Arts, Vienna.

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Upcoming screenings and premieres in 2023 include the International Kurzfilmwoche Regensburg and a collaboration with New York Philharmonic concert pianist Eric Huebner in New York State. 

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Aside from composing purely acoustic music for orchestra, small ensembles and solists, Muir's own music theater pieces include "Von Sodom und Gomorra nach Berlin" premiered in 2012 at the Münchener Biennale as well as "Neue Szenen" prize at the Deutsche Oper, for the piece "Wie man findet, was man nicht sucht", premiered in April of 2013. Her Music Video and Video Art pieces have been screened at the Matera Festival in Bari Italy, Soundtrack Cologne, The Denkerei Berlin, Espacio Center, Spain. "Lost Time" was composed in conjunction with Chihura Shiota's installation at the Stadtmuseum Nikolaikirche in Berlin. She has developed a series of pieces for solo performers performing duos with their video counterparts, such as in Just 34 and Double Treble and music videos. Muir has worked with internationally renowned soloists such as David Friedman, Lorelei Dowling, Irene Kurka, Nathan Plante and Michael Weilacher in order to compose a series of solo pieces to exhibit the virtuosity of each individual musician.

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 In Berlin, she has been guest professor in the composition department at the Berlin University of the arts teaching composition, where she was also the Artistic Directer and co-founder of Ensemble ilinx, Studio for New Music at the Berlin University of the Arts. She is currently on the faculty of the Berlin Stanford Undergrad Bing Overseas Program.