This marimba sonata is written in a "double-function-form" as in the words of musicologist William Newman (1912-2000). It's a single movement in classical sonata form, though cutting the repeat of the exposition and basically skipping the reprise in favor of a coda. It's also the most basic A-B-A form when seeing the musical characters of the calm introduction, wrought up middle section and quiescent conclusion. A third form layer occurs when combined with the two sisterworks, sonatas in A-major and c-minor. All three share this special formal structure, are thematically connected via a recurring "sister motif" and feature three quotes from works by danish composer Carl Nielsen (1865-1931).