Mummer, the album by XTC, refers to what kind of folk play?
Mummers' Plays
Title: Mummers play
Passage: Mummers' Plays are folk plays performed by troupes of amateur actors, traditionally all male, known as mummers or guisers (also by local names such as "rhymers", "pace-eggers", "soulers", "tipteerers", "wrenboys", and "galoshins").  It refers particularly to a play in which a number of characters are called on stage, two of whom engage in a combat, the loser being revived by a Doctor character.  This play is sometimes found associated with a sword dance though both also exist in Britain independently.
Title: Wonderland (XTC song)
Passage: "Wonderland" is a single by XTC released in June 1983, written by Colin Moulding and taken from the album Mummer.
Title: Mummer (album)
Passage: Mummer is the sixth studio album by the English band XTC, released on 30 August 1983.  It reached No. 51 on the UK album chart and No. 145 on the U.S. Billboard album charts.  The album title refers to a Mummers play.  Working titles considered for the album were "Fruit" and "Fallen From The Garden".
Mummer (album) Mummers play