Learn English – Word designating something as being representative of a whole

It might be related to hyperacusis, "a health condition characterized by an over-sensitivity to certain frequency and volume ranges of sound (a collapsed tolerance to usual environmental sound)."...but that is a medical condition, and I think you're asking for a word for the feeling itself.

I think the word you're looking for is either ineffable or euphoria (or a combination of both).

INEFFABLE: /ɪnˈɛfəb(ə)l/ too great or extreme to be expressed or described in words.

Via: http://dictionary.reference.com/browse/ineffable

AND

EUPHORIA: /juːˈfɔːrɪə/ a feeling or state of intense excitement and happiness.

Via: https://en.wikipedia.org/wiki/Euphoria