Simon Jonathon Gallup (born 1 June 1960 in Duxhurst, Surrey) is an English musician and bassist of the post-punk band The Cure.

Simon is the youngest of six children born to Bob and Peg Gallup. His siblings are Stuart, David, Duncan, Monica, and Ric. After moving to Horley, Surrey in 1961 he attended Horley Infants and Junior Schools between 1961 and 1975, followed by Horley Balcombe Road Comprehensive from 1971-1976. Between 1976 and 1978 he worked in a plastics factory and became the bass player for local punk band Lockjaw, who later evolved into The Magazine Spies (1979-1980), also known as The Mag/Spys. Lockjaw and The Mag/Spys played regular live shows with Easy Cure and later The Cure between 1977 and 1979, and after collaborating in the studio on the Cult Hero recording sessions in October 1979, both Gallup and keyboardist Matthieu Hartley left The Mag/Spys to join The Cure. Former Mag/Spys Gallup, Hartley and Stuart Curran later performed together under the name of The Cry and later Fools Dance during Gallup’s hiatus from The Cure between 1982 and 1984.

The Cure are an English alternative rock band formed in Crawley, West Sussex in 1976. The band has experienced several line-up changes, with frontman, vocalist, guitarist and principal songwriter Robert Smith being the only constant member. The Cure first began releasing music in the late 1970s with its debut album Three Imaginary Boys (1979); this, along with several early singles, placed the band as part of the post-punk and New Wave movements that had sprung up in the wake of the punk rock revolution in the United Kingdom. During the early 1980s, the band's increasingly dark and tormented music helped form the gothic rock genre.

After the release of Pornography (1982), the band's future was uncertain and Smith was keen to move past the gloomy reputation his band had acquired. With the 1982 single "Let's Go to Bed" Smith began to place a pop sensibility into the band's music (as well as a unique stage look). The Cure's popularity increased as the decade wore on, especially in the United States where the songs "Just Like Heaven", "Lovesong" and "Friday I'm in Love" entered the Billboard Hot 100 chart. By the start of the 1990s, The Cure were one of the most popular alternative rock bands in the world. The band is estimated to have sold 27 million albums as of 2004. The Cure have released thirteen studio albums, 10 EPs and over thirty singles during the course of their career. Since 2010, they have been working on a fourteenth studio album.

Roger O'Donnell (born 29 October 1955, in East London) is an English keyboardist best known for his work with The Cure. O'Donnell has also performed in the Psychedelic Furs, the Thompson Twins and Berlin, as well as having an active solo career.

O'Donnell was born into a musical family, next to the piano in his parents' London home. O'Donnell attended Art School but left to pursue a career as a professional musician, with his first paying gig coming in 1976, at Oxford Town Hall backing legendary British pop icon Arthur Brown.

In the early 1980s, while with The Thompson Twins, Berlin, and The Psychedelic Furs, O'Donnell was a big fan of synthesisers produced by Sequential Circuits, which produced such classics as the Prophet 5, Prophet T8, and Prophet VS. While on tour with The Psychedelic Furs, O'Donnell set the record for having the most Sequential models onstage at one time.

O'Donnell first joined The Cure in 1987, replacing Lol Tolhurst on keyboards, after being longtime friends with drummer Boris Williams. He played with The Cure during their Kiss Me Kiss Me Kiss Me tour, though he did not contribute to the album. (He does however appear in the music videos for "Just Like Heaven" and "Hot Hot Hot!!!" and appeared in tour promo art.) With O'Donnell on keyboards, Porl Thompson was able to focus on guitar full time, instead of assisting Tolhurst on keyboards for many of the songs. Some of O'Donnell's performances from this tour can be heard on the deluxe edition of Kiss Me, Kiss Me, Kiss Me.