First Movement: Quasi lento

Second Movement: Poco Adagio

Third Movement: Allegro assai

Composed as an elegy for the British composer Gerald Finzi, the original title of the piece was “Janua Coeli (Gate of Heaven)”. It was premiered by Robin Harrison. In contrast to the bright and lively Sonata No. 1, this work possesses a grave and profound musical character. While developing serially, Williamson's unique idiom, characterized by the sudden emergence of tonal centers at various points, enhances the expressive power of this work.

In 1970, it underwent significant revision, changing from a five-movement structure to a three-movement structure.