I notice that Walter Zev Feldman's new book is out, "From the Bronx to the Bosphorus: Klezmer and Other Displaced Musics of New York." Feldman, a musicologist, is one of the key figures in the #klezmer revival & recorded with Andy Statman in the 70s. His 2016 book Klezmer: Music, History and Memory, for whatever minor parts I may disagree with, is one of the only reliable academic works in English on the genre.
https://www.fordhampress.com/9781531509767/from-the-bronx-to-the-bosphorus/