As far as I know, the Henry Watson Music library still has Bronson, though I would appreciate some information on that from any Mancunian who has a reader's ticket.
A colleague of mine who had access to information about Leeds City library said that they were considering throwing their copy out some years ago. We need to have a campaign to keep such important traditional research available to those who want to learn from scholarship of this order. The volumes may not be borrowed frequently, but their importance should not be compared to pulp fiction.
The John Rylands University Library of Manchester used to have a set, but I am not certain that it still does. ( I used to borrow it far more than I ever borrowed Biology books - that was what I was supposed to be reading!). Terry Whelan told me that he bought three volumes from them because the fourth volume was missing, and later found the fourth volume to complete the set from someone in the USA who had failed to return it to the library after completing their studies.
A Manchester Uni student could do a search and let us know. Anyone out there?