The following sites will be of interest to Music Hall Enthusiasts:

Bill Clark's 78rpm Website: History of recording.
Music Hall 78s and cylinders purchased.
Gramophone Steel Needles Sold

The British Music Hall Society: History of Music Hall and Variety.
Regular Meetings and Quarterly Magazine.

"Make 'Em Laugh!": Words and Lyrics to Music Hall Songs and Monologues

"Retro Jukebox": An internet radio station of songs and entertainment belonging to days gone by