My Ladye Nevells Booke is a collection of 42 keyboard pieces by the greatest English composer of his day, William Byrd. It includes dances, variations, contrapuntal fancies and battle-pieces, and was compiled seemingly from the composer’s manuscripts for Lady Nevell, half-sister of Francis Bacon and third wife of Sir Henry Nevell of Billingbere, who was her second husband. The volume, dated 1591 and handsomely bound, was acquired by the British Library in 2006. It constitutes a significant monument to Byrd’s achievement as a composer for the virginals.