From my non-trained perspective, I always understood the normal definition of 'noise' to be 'any unwanted sound'. So I would take the definition of 'noise' as in deliberate noise to be something like 'the deliberate artistic creation of sounds that would noramlly be considered extraneous', but I'm making it up as I go along really. That also means that any band with any feedback at all are making 'noise music', so that's unsatisfactory. So I could amend my first thughts to 'any piece of audio entertainment that relies mainly upon the deliberate artistic creation of sounds that would noramlly be considered extraneous'. Which seems closer to what I want.
It also excludes birdsong, as it presumably always has a purpose, rather than being purely for 'entertainment'.
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