Duncan Hemstock

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Callum Au: Sing Seven Seas

by Neil Duggan
May 26, 2026

Callum Au is not one for half measures. As an arranger he has worked with international orchestras and contributed to movie scores; as a performer he is an in-demand session trombonist. He steps into the spotlight with Sing Seven Seas, a project of genuinely epic ambition: 81 musicians, a voiceover artist, 16 compositions and nearly two hours of music. The album explores classic swing, progressive orchestral arrangements and contemporary jazz, with Au contributing trombone alongside a remarkable cast of cross-generational ...