and liturgical texts in a contemporary context and writing laments and petitions on behalf of the persecuted Catholic community, which seems to have adopted Byrd as a kind of 'house' composer. Some texts should probably be interpreted as warnings against spies (Vigilate, nescitis enim) or lying tongues (Quis est homo) or celebration of the memory of martyred priests (O quam gloriosum). Byrd's setting of the first four verses of Psalm 78 (Deus venerunt gentes) is widely believed to refer to the brutal execution of Fr Edmund Campion in 1581 an event that caused widespread revulsion on the Continent as well as in England. Finally, and perhaps most remarkably, Byrd's Quomodo cantabimus is the result of a motet exchange between Byrd and Philippe de Monte, who was director of music to Rudolf II, Holy Roman Emperor, in Prague. In 1583 De Monte sent Byrd his setting of verses 1–4 of Vulgate Psalm 136 (Super flumina Babylonis), including the pointed question "How shall we sing the Lord's song in a strange land?" Byrd replied the following year with a setting of the defiant continuation, set, like de Monte's piece, in eight parts and incorporating a three-part canon by inversion. Thirty-seven of Byrd's motets were published in two sets of Cantiones sacrae, which appeared in 1589 and 1591. Together with two sets of English songs, discussed below, these collections, dedicated to powerful Elizabethan lords (Edward Somerset, 4th Earl of Worcester and John Lumley, 1st Baron Lumley), probably formed part of Byrd's campaign to re-establish himself in Court circles after the reverses of the 1580s. They may also reflect the fact that Byrd's fellow monopolist Tallis and his printer Thomas Vautrollier had died, thus creating a more propitious climate for publishing ventures. Since many of the motet texts of the 1589 and 1591 sets are pathetic in tone, it is not surprising that many of them continue and develop the 'affective-imitative' vein found in some motets from the 1570s, though in a more concise and concentrated form. Domine praestolamur (1589) is a good example of this style, laid out in imitative paragraphs based on subjects which characteristically emphasise the expressive minor second and minor sixth, with continuations which subsequently break off and are heard separately (another technique which Byrd had learnt from his study of Ferrabosco). Byrd evolved a special "cell" technique for setting the petitionary clauses such as miserere mei or libera nos