inundado por um mistério de luz que é Deus e N´Ele vi e ouvi -A ponta da lança como chama que se desprende, toca o eixo da terra, – Ela estremece: montanhas, cidades, vilas e aldeias com os seus moradores são sepultados. - O mar, os rios e as nuvens saem dos seus limites, transbordam, inundam e arrastam consigo num redemoinho, moradias e gente em número que não se pode contar , é a purificação do mundo pelo pecado em que se mergulha. - O ódio, a ambição provocam a guerra destruidora! - Depois senti no palpitar acelerado do coração e no meu espírito o eco duma voz suave que dizia: – No tempo, uma só Fé, um só Batismo, uma só Igreja, Santa, Católica, Apostólica: - Na eternidade, o Céu! 
The subject of sacred music has always been very close to Our heart. Hence it has seemed appropriate to us in this encyclical letter to give an orderly explanation of the topic and also to answer somewhat more completely several questions which have been raised and discussed during the past decades. We are doing so in order that this noble and distinguished art may contribute more every day to greater splendor in the celebration of Divine worship and to the more effective nourishment of spiritual life among the faithful.Click here to read Musicae Sacrae.
2. At the same time We have desired to grant what many of you, venerable brethren, have requested in our wisdom and also what has been asked by outstanding masters of this liberal art and distinguished students of sacred music at meetings devoted to the subject. The experience of pastoral life and the advances being made in the study of this art have persuaded Us that this step is timely.
3. We hope, therefore, that what St. Pius X rightly decreed in the document which he accurately called the "legal code of sacred music may be confirmed and inculcated anew, shown in a new light and strengthened by new proofs. We hope that the noble art of sacred music--adapted to contemporary conditions and in some way enriched--may ever more perfectly accomplish its mission.
4. Music is among the many and great gifts of nature with which God, in Whom is the harmony of the most perfect concord and the most perfect order, has enriched men, whom He has created in His image and likeness. Together with the other liberal arts, music contributes to spiritual joy and the delight of the soul.
5. On this subject St. Augustine has accurately written: "Music, that is the science or the sense of proper modulation, is likewise given by God's generosity to mortals having rational souls in order to lead them to higher things."
SOURCE