for SATB (with divisions) and piano or organ The third movement of McDowall's powerful Da Vinci Requiem, I obey thee, O Lord is a compelling pairing of the 'Lacrimosa' text from the Latin Missa pro defunctis with extracts from the Notebooks of Leonardo da Vinci, and has a poignant, tender simplicity. The composer has reworked the keyboard part from the parent work to facilitate performance by piano or organ. McDowall's music . . . combines expressive lyricism with a natural facility for choral writing.