Think about it dude. As an example, now we hear a person with a very good singing voice and just simply think "Wow, she/he has a very good voice" but back in the ages, they heard it and felt that there was some mystical force behind the singing. Christians, for example, in the past believed(maybe some still do today) that music is language of the Angels. Music probably was the basic foundations of some cultures. So for building a civilisation, YES music, just ART in general, is very, very important. Whether music is important in terms of need as a species and its relationship with nature, many believe not.
Experiance is what really gives you answers you seek so I'll just suggest that you listen to the voice of someone like a female opera singer, not even that just the hot chick from Evanesence will do (I suggest, very arbitrarily, the song Lithium) any singing displaying beauty instead of horror like the psychos we listen to. I mean REALLY listen to it. Close the eyes. Resist the urge to hate it and call it wussy and mediocre. Forget the lyrics, and really let yourself feel the voice. Breath it in. If you genuinally feel something, like a tingle running through your spine leading to goosebumps, THAT is when you want to imagine what people in the past, when music had been new, must of thought and believed when they heard such things.