[7] In 2017, whilst still an undergraduate at the RNCM, she was co-commissioned by BBC Radio 4's Front Row programme and The Proms to compose her work entitled River, which was written to celebrate the 300th anniversary of George Frideric Handel's Water Music.
[15] In 2018, the piece received its United States premiere at the Norfolk Chamber Music Festival by the Philharmonia Baroque Orchestra.
[16] In November 2017, the BBC Philharmonic[17] performed her orchestral work Kintsukuroi: (Golden Repair),[18] conducted by Mark Heron,[19] in a special joint concert with Psappha New Music Ensemble for BBC Radio 3 broadcast[20] as part of the biennial New Music North West Festival.
[25][26] Her debut chamber opera in one act entitled The Yellow Wallpaper, for which Mason wrote the libretto based on the short story of the same name by Charlotte Perkins Gilman, was produced by the Helios Collective to receive its premiere performance at the English National Opera's Lilian Baylis House in 2016.
[27][28][29][30] Mason's music has been included in events and festivals such as BBC Radio 3's Young Artist Day,[31] in which her work "Diamond Dust II" for Clarinet in Bb and Piano was broadcast live,[32] her setting of Psalm 93, "The Lord Is", was premiered in the London Festival of Contemporary Church Music 2017[33] by the Sarum Consort,[34] and in the Open Circuit Festival 2016 in which her piece "Let The Rain Kiss You", inspired by the poem "April Rain Song", by Langston Hughes was performed by trombonist, John Kenny.