Deep Listening

Pauline Oliveros was an accordion player who became interested in electronic recording and processing techniques.  In what seems a surreal combination, she melded her instrument and the new technology into a unique relationship with sound.  She was interested in the focussed attentional process as applied to music listening.
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When being lowered into an underground silo for a performce she couned the term `deep listening` as a pun – which stuck.  She expanded this into a new musical theory, "sonic awareness", and describes it as "the ability to consciously focus attention upon environmental and musical sound", requiring "continual alertness and an inclination to be always listening" 
It`s worth listening to her TED talk - https://www.youtube.com/watch?v=_QHfOuRrJB8