Composer's live recording originally taking place in large city (6)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

BE (live) + R{ecording} [originally] contained by [taking place in] WEN (large city). ‘The Great Wen’ is a disparaging nickname for London. The term was coined in the 1820s by William Cobbett, a radical pamphleteer and champion of rural England [Wiki]. Webern is a composer most definitely not represented in my music collection.