Task: Question Answering
Input (English): Passage: At the turn of the 17th century, Monteverdi found himself the target of musical controversy. The influential Bolognese theorist Giovanni Maria Artusi attacked Monteverdi's music (without naming the composer) in his work L'Artusi, overo Delle imperfettioni della moderna musica (Artusi, or On the imperfections of modern music) of 1600, followed by a sequel in 1603. Artusi cited extracts from Monteverdi's works not yet published (they later formed parts of his fourth and fifth books of madrigals of 1603 and 1605), condemning their use of harmony and their innovations in use of musical modes, compared to orthodox polyphonic practice of the sixteenth century. Artusi attempted to correspond with Monteverdi on these issues; the composer refused to respond, but found a champion in a pseudonymous supporter, "L'Ottuso Academico" ("The Obtuse Academic"). Eventually Monteverdi replied in the preface to the fifth book of madrigals that his duties at court prevented him from a detailed reply; but in a note to "the studious reader", he claimed that he would shortly publish a response, Seconda Pratica, overo Perfettione della Moderna Musica (The Second Style, or Perfection of Modern Music). This work never appeared, but a later publication by Claudio's brother Giulio Cesare made it clear that the seconda pratica which Monteverdi defended was not seen by him as radical change or his own invention, but was an evolution from previous styles (prima pratica) which was complementary to them.This debate seems in any case to have raised the composer's profile, leading to reprints of his earlier books of madrigals. Some of his madrigals were published in Copenhagen in 1605 and 1606, and the poet Tommaso Stigliani published a eulogy of him in his 1605 poem "O sirene de' fiumi". The composer of madrigal comedies and theorist Adriano Banchieri wrote in 1609: "I must not neglect to mention the most noble of composers, Monteverdi ... his expressive qualities are truly deserving of the highest commendation, and we find in them countless examples of matchless declamation ... enhanced by comparable harmonies." The modern music historian Massimo Ossi has placed the Artusi issue in the context of Monteverdi's artistic development: "If the controversy seems to define Monteverdi's historical position, it also seems to have been about stylistic developments that by 1600 Monteverdi had already outgrown".The non-appearance of Monteverdi's promised explanatory treatise may have been a deliberate ploy, since by 1608, by Monteverdi's reckoning, Artusi had become fully reconciled to modern trends in music, and the seconda pratica was by then well established; Monteverdi had no need to revisit the issue. On the other hand, letters to Giovanni Battista Doni of 1632 show that Monteverdi was still preparing a defence of the seconda practica, in a treatise entitled Melodia; he may still have been working on this at the time of his death ten years later. 
Question: What was Monteverdi likely working on at his time of death?
Output (English): Melodia.