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Æterna Sirius formed in 2017 when former classmates Jessica Yam and Elias-Axel Pettersson decided to join forces in presenting four-hand and two-piano music. Both pianists met in 2002 as students of Douglas Humpherys at the Eastman School of Music. Upon graduation, they parted ways, only to reconnect briefly in 2006 during an audition weekend in Cleveland. Time intervened again, until 2017, when Elias visited Arizona and reconnected with Jessica after an 11-year hiatus. Æterna Sirius was born.

Æterna Sirius has given masterclasses/lectures at Arizona State University, Arizona Piano Institute, Adamant Music School, and ASMTA's 2018 State Conference, and has performed across the US. They present new music alongside standard repertoire for both piano four-hands and two pianos.​

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