Music in the context of it being a universal language needs to be bereft of text, as language in the text is restrictive to this aspect of music. In this aspect of music I feel that music without text is a personal experience of feeling music rather than hearing music.
Music is also a means of communication, and communication requires clear text for comprehension of the message. Sounds of instruments may provide the background, but it is the text that conveys the message. I appreciate music without text, but when text is a part of the music, I like the text to be clear, so that I can pick up the text. To me inclusion of text without clarity in its expression is a worthless exercise. Another musical instrument may as well have been added in place of the vocal text.
There is no better example of the use of music to spread a message in modern times, than Hippy music. It developed as a means to express opposition to the establishment and the War in Vietnam, conveying the message of peace and universal brotherhood, and developed its own political power. The text of hippy music through repetition is clear, as it hammers out this message of peace and universal brotherhood.
It may be this attachment for clear text that has made me fond of Country and Western music. The clarity makes it possible to experience what the text is trying to communicate. Images of a way of life, as a reflection of the text, float before me, and I am transported into the world of the text, maybe feeling the nostalgia of home that an outlaw feels, or heartbroken at the loss of a sweetheart or in strong emotional love for the land and the way of life. Such experiences are absent, when the text is not clear, and a feeling of something being missing arises.
It is this enhanced experience that text can provide to music that lies behind my claim that text in music is a means to the message in the music, and such being the case the text needs to be clear.