This work was awarded the British Composer Award for Liturgical Music in 2003 but is published for the first time in 2013. The Roman Catholic Liturgy includes an antiphon to the Magnificat at Vespers O Doctor optime which Jackson sets incorporating medieval influences such as plainsong.

Ever-changing in mood and pace La Musique is a setting of poems by Elizabeth Bishop and Charles Baudelaire on the transformative power of music. Jackson musically represents the complex psychological shifts contained in the texts' metaphors through alternating fully notated and indeterminate passages.

This major work by one of Britain's leading choral composers was commissioned by St Mary's Cathedral Edinburgh. Jackson's only mass to date the setting is terse and direct in the manner of the Poulenc Mass and the textures often unusually pared-down. By turns fiery and exuberant and inward and numinous the music includes a huge variety of textures and techniques including flower melismas l…

This piece stems from an ongoing partnership between the composer and the writer Richard George Elliott. The profound sentiments expressed in Elliot's poem about the firmament are evoked by Jackson's use of colourful shimmering textures and an underlying sense of spaciousness. An impressive concert work this is complex but utterly compelling choral writing.

For SATB (with divisions) unaccompaniedThis atmospheric piece sets a haunting secular text by Doris Kareva. In style it is contemplative with a clear expansive melody and Jackson skilfully conjures up a sense of the undulations of a ship at sea through the lilting lines of the accompanying voices. This piece is an ideal choice for choirs looking for something unique and memorable for their next …

Jackson's work couples the expressive language of a medieval Latin hymn with the Collect for St Margaret of Scotland. The use of hockets and isorhythms give the music a deep medieval grounding whilst the beautifully ornamented melodies bring out a distinctively 'Scottish' sound to this dramatic work.

Setting a text by George Herbert depicting the awe and mystery of the Christian faith this simple work for trebles and organ makes full use of Jackson's gift for melody with his trademark florid organ accompaniment.

Jackson effectively intersperses sonorous polyphonic passages for full choir with spoken text and murmuring ostinato motifs in free time.

Grodek is thought to be the last work of the Austrian poet Georg Trakl; the title refers to the town where Trakl served as a medical officer in the First World War. Jackson's setting captures the darkness of the text with an eerie opening building to a powerful climax.

Bright electric and charged with energy this setting of one of the seven Advent 'O' Antiphons features Jackson's characteristic flourishes of melodic ornamentation tempered by moments of calm from the sustained lower voices and softly spoken phrases in the upper voices.