Anthony Pitts' XL is a setting of Psalm 40 for 40 singers (8 x SATBarB), which he describes as a companion piece for Tallis's masterpiece Spem in alium. 

this piece is from the Faber New Choral Works Series introduces a wealth of new or recently written choral music to choirs in search of fresh repertoire. The series draws in a rich diversity of living composers and includes both lighter and more challenging contemporary works, offering a thrilling array of varied styles.