She has taken part in several hundred concerts, international and national projects (including the Eurovision Song Contest), and worked with artists, orchestras and on films in Europe, America, and Ukraine.

[citation needed] Her more than 20 concerts in the UK ranged from the small village of Tebworth with 50 people to performing at St Albans Cathedral,[5][6] as well as a special charity event with the British Royal Family—the Duke of Edinburgh, son of Queen Elizabeth II.

[9] In June and July 2023, Yaremak worked as a music editor on the score for the new soundtrack to the 1930 silent film Earth by Oleksandr Dovzhenko in collaboration with composer Luke Coraddine.

[13][14] On 24 February 2024, she performed her own compositions and arrangements of ancient Ukrainian fantasy melodies at a charity event dedicated to the second anniversary of the Russian invasion of Ukraine at Bath Abbey.

On 8 September 2021, Lviv Fashion Orchestra[17] held an experimental music and fashion show of designer Marta Wachholz's new collection in Lviv,[19] where the composer worked on creating music, composing orchestral scores together with Mariia Oliinyk, Uliana Horbachevska and Mykhailo Baloh, performed by the INSO-Lviv Symphony Orchestra.

In 2024, Mariia created arrangements for the concert show of Within Temptation vocalist Sharon den Adel at the Atlas United festival.

[26] In December 2024, Mariia Yaremak took part in a special Christmas program Ukrainian Carol of Hope organised by Campaign for Ukraine.

The event was held at St. Pancras Station in London, where Ukrainian melodies arranged by Mariia ("Shchedryk," "Podolyanochka," "Ivanku," "Kotyku Sirenkyi," "Oy u Vyshnevomu Sadu") and her original compositions were performed on Elton John's iconic piano.

[27] British actress Kristine Millward performed poems by Viktoria Amelina and Maksym Kryvtsov to the accompaniment of Mariia's music.

In addition, in collaboration with the choreographer Mariia Bakalo, eight audio lessons of 45 minutes each were recorded as part of the contemporary dance project "Listen with Your Body.