Gary:

Thanks very much for the reference. It reveals that I was mistaken about the tune that most Americans used to know for "Mandalay". It is the one by Oley Speaks, and it is not a music-hall tune that made it across the Atlantic; Speaks was an American, and the tune hails from Cincinnati!

Kipling was well known in America, and it is not surprising that Yanks as well as Brits made up music for his songs. However, it still appears that an enormous corpus of largely British tunes has pretty much disappeared.