Reclusive Paul McGuigan, also known as Guigsy was the founder of The Rain, which also featured fellow ex-Oasis members Bonehead (aka Paul Arthurs) on guitar and Tony McCarroll on drums, in the late 1980s. Originally, Chris Hutton had been on lead vocals but he missed out on the big time when he was fired and the Gallagher brothers, Liam and Noel, arrived in his place.
With the group's name changed to Oasis, they released their first single, Supersonic, in 1994 - and that was just the first stepping stone to worldwide fame, with more than 75 million albums sold over the years. However, Guigsy wanted no part in Oasis in the long-term; the bassist briefly quit a year later due to exhaustion, before leaving permanently in 1999. One of the calmer members of Oasis, he never shared the loud and straight-talking reputation Noel and Liam developed, and was even described as a "calming influence" on everyone else.
There was one notable exception - a fierce bust-up with Liam on a ferry heading for Amsterdam, leading to them both getting locked in a cell and then deported back to the UK.
They hit the headlines for that escapade before their debut single had even been released, although it's far from the biggest fight the Gallaghers have ever had - Noel once alleged that German police had "pulled his teeth out with pliers" while he was unconscious following a brawl.
After Guigsy left the group, Noel later went on to claim he'd spoken to him for just an hour over 17 years, and accused him of caring more about cannabis than music.
He stated scathingly in the Supersonic documentary: "He loved cricket and Doctor Who and weed and Man City. I'd say fifth after that was being in Oasis."
Guigsy ultimately retired from the music business altogether, and on the rare occasions that he's been publicly spotted near his London home, he has looked virtually unrecognisable compared to his 1990s heyday.
However, he is said to be happy with his low-key lifestyle, which some believe is a better match for his personality.
He also had other interests, including a book he co-wrote with journalist Paolo Hewitt about sporting legend Robin Friday, titled The Greatest Footballer You Never Saw.
Meanwhile, fans are insisting he's the greatest underrated bassist, with several quizzing on a forum recently: "What happened to him?!"
His sister Mary once joined an Oasis podcast to describe him as "incredibly shy and quiet", and confirm he hadn't expected the band to hit the big-time and had never enjoyed fame.
Addressing his departure, one fan suggested: "He doesn't need the money and he doesn't want the attention."
Meanwhile, another wrote: "Some people know when they've had enough. Some people will never not want more no matter what. Both seem cool in their own ways."
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