Six In 2017, Marlow co-composed and co-wrote the musical
Six, produced by
Kenny Wax. The musical received positive reviews at the 2017 Edinburgh Fringe Festival and went on to be performed in the
West End in London. On 28 July 2019, Marlow stepped into the role of
Catherine Parr for two sold-out performances at London's
Arts Theatre when a cast member was on vacation, the two standbys for the role were out sick, and the other understudy was performing in a different role in the show. Marlow, along with their collaborator
Lucy Moss, signed with
Warner Chappell Music in August 2019.
Six began previews on
Broadway at the
Brooks Atkinson Theatre on 13 February 2020 and was scheduled to open on 12 March 2020. However, the show's opening night was delayed due to the closure of all Broadway theatres because of the
COVID-19 pandemic. Previews for the show resumed on 17 September 2021 and the official opening night occurred on 3 October 2021. On 12 June 2022, Marlow became the first openly
non-binary composer–lyricist to win a Tony Award, sharing the
Tony Award for Best Original Score for
Six with Moss. ==Recognition==