backdoor broadcasting is an amazing resource of audio material, in their own words –

We are a mobile audio webcasting service, which concentrates on recording academic research.  We are hired by universities, learned societies and research institutes to record  their research as presented at conferences, symposia, workshops, public lectures and seminars and to disseminate it  to a ready-made world-wide audience.

It was recommended to me by philosopher friend Martin Wooster.

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