The Scottish singer, best known for songs like Black Horse and the Cherry Tree and Suddenly I See, says working on the show was a "dream project". She says the original soundtrack was a big inspiration, and describes the music as "a mixtape of all your favourite 90s bangers". The process of creating the soundtrack for Clueless: The Musical was intense for Tunstall, who says it's no easy feat to add music to an adaptation of a film that didn't originally have it. "You really have to think about whether a song fits the structure and flow of the story and whether it actually helps the audience understand the narrative better," she says. Heckerling says she actually wishes the film had been a musical because "there were natural moments in the script where characters could have sung". "Those types of films weren't very common in the 90s but I'm glad we could add in music now," she says. Critics had mixed thoughts about the new songs - the Guardian called them "disappointingly flat-footed" in a two-star review and said the lyrics "too often serve as exposition rather than raising the emotional drama". Similarly, the Telegraph's Dominic Cavendish wrote that the show has "numbers designed to sound in keeping with the period but which are so generic they don't ring with real-world authenticity". But What'sOnStage praised Tunstall's "infuriatingly catchy tunes" and Glenn Slater's "nifty, witty lyrics".