Thanks to Barcelona Cristiana, that he reminded me of this great article:
www.catholicapologetics.info/…/rock.htm

The Rock and Roll Revolution
By Orlando Fedeli
Introduction: The power of music
I - Music: Symbols – Ideas and Morality
II – Rock and Revolution
III - The beat and its effects
IV - Rock e Religion
Conclusion
Introduction:
The power of music

“Rock is a basic way to express passions which, in big audiences, may assume characteristics if cult or even adoration, contrary to Christianism.”
(Cardinal Joseph Ratzinger, Pope Benedict XVI)

It is a lot common to find parents who do not care about their sons and daughters spending hours listening to high volume Rock for they consider “there’s no problem in it”. They, when young, used to listen to romantic songs or jazz music. They would play then to their kids when they were children. Now those kids are grown-ups and unconsciously took in the consequences of the musical and educational principles they have received: just listen to rock.
From sugar-coated romanticism to frantic rock, passing through the intermediate step of sensuous jazz, there is a coherent logic the soul goes through, even if that should happen unconsciously.
Rock itself registers, faster though, the same steps in its way. Beginning with sentimental lyrics and songs, it soon reached the frenzy and evil cliffs. Not by chance does the song that is considered “official hymn” of rock – Stairway to Heaven - goes through these phases: sentimental, sensuous, and frantic. (There were other reasons to label this song as “hymn” of rock which we will later examine.)
It is also common to find youngsters who, when acknowledge the lyrics of songs they listen, say they do not understand the lyrics and only care about the beat or, a lot rarer, by the melody.
They do not notice the song has deep effects in the human soul. It is evident that when they hear or read such statement they place a doubt upon it. However they recognize rock fires them and make them cheerfully excited. They must also recognize that there is music that goes best to terror films, which incline the soul to fear the unknown. There are others that are well-matched with love and sentimental scenes. They will not be able to deny that certain songs produce melancholy and sadness, others awake happiness, and others produce enthusiasm...