Clowning around ... An actor fixes her costume in the dressing room. Photograph: Tristram KentonPhotograph: Tristram KentonMozart Undone is a ‘theatre concert’ invented by the Danish director Nikolaj Cederholm. Photograph: Tristram KentonPhotograph: Tristram KentonPrevious theatre concerts have been devoted to the Beach Boys, Bob Dylan and the Beatles. The actor in the centre of the picture is Lotte Andersen – familiar to fans of the TV scandi-crime dramas The Killing and The Bridge II. Photograph: Tristram Kenton for the GuardianPhotograph: Tristram KentonThe performers get splashed and splattered during Mozart Undone. Photograph: Tristram KentonPhotograph: Tristram KentonThe water is a reference to the purity of Mozart’s music, says Cederholm. Photograph: Tristram KentonPhotograph: Tristram KentonMeanwhile, the music takes in cabaret, bluegrass, soft rock, R&B and a cappella. Photograph: Tristram KentonPhotograph: Tristram KentonPerformers end up in some difficult positions, hanging upside down or squeezed into an enormous bell jar. Photograph: Tristram KentonPhotograph: Tristram KentonMark Linn, left, and Lotte Andersen. Photograph: Tristram KentonPhotograph: Tristram Kenton The company have had to bring over their own water system: two huge tanks, one for supply and one for collecting the waste. Photograph: Tristram KentonPhotograph: Tristram KentonThe instruments are protected from the water – they’re covered by condoms. Photograph: Tristram KentonPhotograph: Tristram KentonCederholm’s theatre concerts have played to thousands over the past two decades. Photograph: Tristram KentonPhotograph: Tristram KentonA Mozart Undone actor in the Barbican lift. Photograph: Tristram KentonPhotograph: Tristram Kenton‘The costumes get so wrecked,’ says Cederholm. ‘Everything and everyone has to be hosed down afterwards.’ The show runs until 1 March 2014. Photograph: Tristram KentonPhotograph: Tristram Kenton