Black Music Hall Performers

The black presence in music hall entertainment is often overlooked, so I was interested to come across a report of a show at the South London Palace, a Victorian music hall in London Road (north of Elephant and Castle). One night in September 1889 the bill included 'J.H. Maxwell, negro comedian and one-armed juggler' and 'Bennett and Harley, negro comedians' (South London Observer, 29.9.1889). Anybody know anymore about them?