A spin-off cabaret show, entitled Musik: The Billie Trix Story, opened in Edinburgh in 2019.

Record producer Bob Saunders (Paul Broughton) is a friend of Billie Trix and a regular at Vic's club.

Dave meets and falls in love with drug dealer Mile End Lee (Tom Walker), who deals at Vic's club.

Several of the musical's songs were pre-released on the Pet Shop Boys' 1999 album Nightlife, including Closer to Heaven, In Denial, and Vampires.

Nightlife was recorded whilst they were writing Closer to Heaven and originally more of the album's tracks appeared in the musical.

An album, Closer to Heaven (Original Cast Recording), was released in October 2001 and was produced by Pet Shop Boys and Stephen Hague.

During the recording of the Pet Shop Boys' Nightlife album, there were many songs written for the musical that never made it to the final cut.

These songs include Tall Thin Men, The Night Is The Time To Explore Who You Are, You've got to start somewhere and Little Black Dress.

In recent interviews, Neil Tennant has blamed this on poor marketing and bad press reviews.

When Closer to Heaven opened in London, the Pet Shop Boys said that there was interest from production companies all over the world, including New York and Germany.

On 8 May 2006, Frances Barber joined Pet Shop Boys to perform "Friendly fire" at a concert for BBC Radio 2.

This production featured a more immersive experience with the theatre transformed into a club setting with cabaret tables, and again replaces the final song, dropping both Positive Role Model and Vocal and instead adding For Every Moment, from the 2019 spin off show Musik.

Stuart King, writing for London Box Office (12 February 2020) noted: For an actress of 62, Ms Barber offers an energised masterclass worthy of a gal considerably junior in years.

In a figure-hugging black bustier - and occasionally straddling a cocktail bar stool - she recounts Billie’s escapades through a non-stop, delusional, coke-fuelled, whiskey-swigging, garrulous ramble, in which she shares her life spent crisis-crossing the globe encountering everyone from Mick Jagger and Andy Warhol to the Dalai Llama and Jean-Paul Sartre.

Her strutting, swaggering, ranting and dead-pan asides are only parked when she takes a turn at the microphone to sing the six songs provided by the Pet Shop Boys (who as co-writers, were sat a few rows in front of this reviewer on Press Night, and were clearly enjoying every moment).