Bonnet was born in Skegness, England in 1947. He had his first hit single with the duo, The Marbles in 1968, with the single "Only One Woman" (Polydor 56 272), which reached Number 5 in the UK Singles Chart. This and its follow-up were both written by Barry Gibb, Robin Gibb and Maurice Gibb of the Bee Gees who had recorded in Australia with Bonnet's bandmate from The Marbles, Trevor Gordon.
Bonnet then quit to do advert jingles. He appeared in the 1974 British comedy film, Three for All as lead singer of 'Billy Beethoven', a fictional band, along with several notable UK comedy personalities and his then partner Adrienne Posta, although his character's lines were limited to only two words.
In 1977 he released an eponymous album, which was certified gold in Australia. The single, "It's All Over Now, Baby Blue", a cover version of the Bob Dylan song, also reached the top five in Australia in 1977, and the following year the single "Warm Ride", written by the Bee Gees, a leftover from the Saturday Night Fever sessions, reached number one there.
In 1979, Bonnet was approached to join UK glam-rock band Sweet to replace Brian Connolly. However, he was chosen by Ritchie Blackmore to replace Ronnie James Dio as the vocalist of hard rock band Rainbow. This was something of a musical departure for Bonnet, who had previously identified himself more as an R&B singer. Bonnet would later credit his time in Rainbow, and his collaboration with Blackmore in particular as changing fundamentally his musical outlook to a more hard rock focus. He sang on the Down to Earth LP, which would become his most successful album. It spawned two hit singles in 1979 and 1980: "Since You Been Gone" and "All Night Long". During Bonnet's time in the band, Rainbow also headlined the inaugural Monsters of Rock festival at Donington Park, Castle Donington.
Bonnet's time with Rainbow was short and he left to resume his solo career, releasing the Line-Up album in 1981, handled by producer John Eden. Following on from his time in Rainbow, the album had a markedly more rock-based sound than his previous solo recordings, whilst retaining some of his former R&B influences. For the recording of Line Up Bonnet enlisted several well-known rock musicians including Whitesnake guitarist Mick Moody, Whitesnake and Rainbow drummer Cozy Powell, Deep Purple and Whitesnake keyboard player Jon Lord, and Status Quo guitarists Francis Rossi and Rick Parfitt. The album reached No. 62 in the UK Albums Chart. The album's lead single, "Night Games", reached No. 6 in the UK Singles Chart, with the follow-up single, "Liar", reaching No. 51. Around this time Bonnet sang on an advertisement for Levi's jeans (the song was entitled "These Eyes"), although his version has never been released.
Tempted by an offer from ex-UFO guitarist Michael Schenker, Bonnet continued his progression to a heavier musical style and joined the Michael Schenker Group (MSG) for the Assault Attack album. However, he was fired from the group after a single concert, at Sheffield Polytechnic (now called Sheffield Hallam University), when he drunkenly exposed himself on stage.
Upon leaving MSG, Bonnet decided to form his own band, drawing inspiration from his days in Rainbow. In 1983, he co-founded Alcatrazz, with Gary Shea (bass), and Jimmy Waldo (keyboards) of the band New England, former Alice Cooper drummer Jan Uvena, and Swedish guitarist Yngwie Malmsteen. The band's debut album, No Parole from Rock N' Roll, featured a distinctly heavy metal sound, with Bonnet describing the material as the heaviest that he had recorded to date. The band enjoyed moderate success in the United States, and major success in Japan.
The band released three studio albums (No Parole from Rock N' Roll, Disturbing the Peace, with guitarist Steve Vai replacing Malmsteen, and Dangerous Games with Danny Johnson on guitar). Alcatrazz also released a live album, Live Sentence, with material from Yngwie Malmsteen's period in the band. For the Dangerous Games LP, Alcatrazz recorded a remake of Bonnet's hit song "Only One Woman" from his first band The Marbles. In 1987, Alcatrazz appeared on the second series of the BBC TV programme Rock School, with Bonnet providing singing tips. The programme also included clips of Alcatrazz in rehearsal. Later that year, Alcatrazz disbanded, and Bonnet returned to his solo career. In 2009, Bonnet reformed Alcatrazz with three new musicians. Bonnet did not consult with his former bandmates Shea, Uvena, and Waldo about re-forming the original line-up, and in response they also re-grouped as a separate version of Alcatrazz. Both bands have official pages on MySpace.com.
Bonnet's post-Alcatrazz projects have all been short-lived and included Blackthorne (working with ex-Balance guitarist Bob Kulick, brother of Kiss guitarist Bruce Kulick), backing vocals for the Danish heavy metal band Pretty Maids' Future World and numerous session work for Forcefield, appearing on To Oz and Back and Let The Wild Run Free. In 1988, Bonnet joined Impellitteri, for their album Stand in Line.
An appearance on Eddie Hardin and Pete York's musical adaptation of Wind in The Willows, performed live in Germany in 1991, saw Bonnet sing on around six of the songs alongside fellow musicians Jon Lord, Don Airey and Ray Fenwick amongst others. Fenwick and Airey also featured heavily on Bonnet's 1991 solo album Here Comes The Night which includes several covers as well as songs credited to by his then wife Jo Eime, and another remake of the Marbles', "Only One Woman".
In 1997 he released Underground, a new solo album, which helped re-establish him with his fan base in Japan. 1999's The Day I Went Mad featured guitarist Slash, Def Leppard guitarist Vivian Campbell, Bruce Kulick plus guitarist, Mario Parga.
Bonnet contributed lead vocals to the Japanese heavy metal band Anthem's 2000 release Heavy Metal Anthem, which had reworks of classic Anthem tracks. Bonnet rejoined Impellitteri in 2000 for their System X album. Meanwhile, his 1999 Japanese solo album got a UK release in September 2001.
At the back end of 2001, Bonnet went on a solo UK tour. His band included keyboard player Don Airey, bassist Chris Childs and drummer Harry James of Thunder and guitarist Dario Mollo.
In early 2004 Bonnet joined Italian guitarist Dario Mollo's new project Elektric Zoo, touring Europe during April. Maintaining the Italian connection, the singer also participated in Matteo Filippini's project, Moonstone, featuring on the track "Not Dead Yet".
In 2006 Bonnet contributed vocals to the Welcome to America album by Taz Taylor Band. The band toured the UK in 2007 and Europe in 2008.
He also appeared in the Countdown Spectacular concert series in Australia between August and September 2007. He sang two songs, "Warm Ride" and "It's All Over Now, Baby Blue".
A press release dated 6 November 2008 reported that Bonnet would be contributing vocals for a highlights CD with the metal opera project, Lyraka. The album Lyraka Volume 1 was released on 2 November 2010. It was announced on 17 November 2010, that Bonnet would also be featured on Lyraka Volume 2.
Bonnet currently resides in Los Angeles, California, from where he continues to record and tour extensively. Bonnet toured the UK with Rainbow tribute band Catch the Rainbow starting in March 2014.
He collaborates in the Stardust Reverie Project, a supergroup featuring Zak Stevens and Lynn Meredith among others. Their first album Ancient Rites of the Moon was released in April 2014. He is currently working in the new Stardust Reverie album scheduled for 2015.
In 2015, Bonnet formed The Graham Bonnet Band, and toured the UK and Europe, playing songs from throughout his career including Alcatrazz and Rainbow. The band released a two-song E.P. titled "My Kingdom Come," (the song "My Kingdom Come", written by Russ Ballard) and announced work on a new studio album to be recorded featuring new compositions and a bonus disc consisting of re-recordings of a number of songs from Bonnet's career. The final line-up of The Graham Bonnet Band is: Graham Bonnet, Vocals; Conrad Pesinato, Guitars; Beth-Ami Heavenstone, Bass; Mark Zonder (Ex-Fates Warning), Drums. The band will resume touring towards the end of 2016.
On 4 November, 2016, The Graham Bonnet Band released their debut album, 'The Book.'1975: Three for All (performer)
1980: Rainbow – Monsters of Rock, Donington '80 (performer)
1985: Rainbow – The Final Cut (performer)
2003: Wind in the Willows – A Rock Concert '91 (performer)
2006: Rainbow – In Their Own Words (interviewee)
2006: Heavy Metal – Louder than Life (interviewee)
2015: The Ritchie Blackmore Story (interviewee)