A comment I just made on "Emes v'Emunah"
Sorry, RHM, I do not agree. I made this point to Rabbi Gershon Schaffel when he was standing next to me at Rabbi Meyer Maryles's chasunah, and the band was playing "Yidden" and Reb Afharon Schechter, RY Chaim Berlin was dancing (clearly in such simcha that he was oblivious to the music). There was extreme dissonance between the exalted expression on his face and the mood (and other dancers) set by the music.
In fact, the ikkar objection to non-Jewish music, IMHO, *is* the tune, and not the lyrics. That is why classical music or folk music is generally not held to be objectionable. The emotions it arouses or amplifies are generally positive ones.
OTOH, one of my colleagues at MTA asked me to watch a DVD "School of Rock." The "hero" expresses his perspective that the core of rock is the "philosophy" of "Stick it to the Man" - being, in this case, any authority or limitation. That is still almost innocuous. Generally, rock "melodies" are meant to evoke and magnify much more negative and animalistic emotions and moods: sexuality (not romance!), violence, depression, anger, etc.
Its the niggun, not the words.