Intricate counterpoint and a continuo-style bassline bring a medieval flavour to Williams' arrangement of this much-loved carol. The gentle vocal lines build in texture throughout, with optional support from the accompaniment. Originally published in The Oxford Book of Flexible Carols, it is also available in a version for two-part and optional accompaniment.

for SA or TB and optional piano/organ/melody instruments Intricate counterpoint and a continuo-style bassline bring a medieval flavour to Williams' arrangement of this much-loved carol. The gentle vocal lines build in texture throughout, with optional support from the accompaniment. Originally published in The Oxford Book of Flexible Carols, it is also available in a version for SATB and optional accompaniment.

for SATB unaccompanied Let nothing trouble you is a striking and atmospheric setting of a prayer by the Spanish mystic, St Teresa of Avila. This work is both comforting and meditative, reflecting the mood of the text, and the music adds a beautifully haunting quality, through the use of a murmuring two-note motif, widely arching melodies, and reflective imitation. Commissioned by The Genesis Foundation for Harry Christophers and The Sixteen, this piece has been recorded by them on the disc 'O Guiding Night' (COR16090).

for SATB and piano O Guiding Night is a colourful and evocative setting of the text 'The Dark Night' by 16th-century Spanish mystic/poet St John of the Cross. Williams's setting really gets to the heart of the words, conveying a range of emotions from hushed excitement to joyous rapture. Sumptuous harmonies and a strong sense of narrative are combined with charming piano interludes in an almost rhapsodic work, which would stand out in any concert.

for SATB (with divisions) unaccompanied Originally published in the New Horizons collection Cantica Nova, this expansive Advent motet creates a unique sound world through unusual harmonic inflections, striking spatial effects, unmeasured notation, and haunting soprano and tenor solos. Featured on CDs by Ex Cathedra (Christmas Music by Candlelight) and The Sixteen (O Guiding Night), O Adonai, et Dux domus Israel is quickly becoming a popular choice for choirs looking to develop their contemporary repertoire.

Suitable for SATB and piano, This up-tempo arrangement combines a funky piano part with walking pizzicato bass, a strong tune, scat vocal lines, and swing-band style vocal harmonies to make a show-stopper.