Paul Ryder, bassist with Manchester band Happy Mondays and brother of singer Shaun, has died aged 58.
A statement said the group and family were "deeply saddened and shocked to say that Paul Ryder passed away this morning".
They said he was "a true pioneer and legend," adding: "He will be forever missed... Long live his funk x"
The band found fame in the "Madchester" era of the late 1980s and early 90s with hits like Step On and Kinky Afro.
They personified the city's intoxicating acid house scene, with a mix of funky rock grooves with dance rhythms that appealed to clubbers and indie fans alike.
The Ryder family and Happy Mondays band members are deeply saddened and shocked to say that Paul Ryder passed away this morning— Shaun Ryder (@officialswr) July 15, 2022
A true pioneer and legend. He will be forever missed ❤️
We thank you for respecting the privacy of all concerned at this time.
Long live his funk x pic.twitter.com/E8e7x4Tvcw
Formed in Salford with Mark Day and Gary Whelan in 1980, the band signed to Factory Records and released their debut album in 1987, followed by 1988's Bummed.
They reached greater heights of fame when 1990's Pills 'n' Thrills and Bellyaches rode the wave of a drug-fuelled music scene that blurred the boundaries between indie and rave.
"The grooves I played in the Mondays came from Northern soul and disco,"Ryder once said in an interview.
"I can't read music, so I just copied the basslines, but I could never get them spot-on so they turned into my own basslines."
Ian Brown, frontman with The Stone Roses, one of the city's other biggest groups at the time, was among those paying tribute.
He wrote on Twitter: "Rest in peace Ryder. A great friend, a great musician, a great fella."
Ex-Hacienda nightclub DJ Graeme Park wrote: "Very sad news. Sorry for your loss. Sending love."
Ride guitarist Andy Bell said: "Really sad news about Paul Ryder, RIP."
Ex-Oasis guitarist Paul "Bonehead" Arthurs wrote: "Thoughts with you all Shaun, sad news xxxxx"
Author Irvine Welsh said: "Terrible news Shaun. All the best wishes to your family."
The Happy Mondays fell apart after the drug-induced chaos of the sessions for their fourth album, Yes Please, in Barbados, and the Ryder brothers both battled heroin addiction.
The group reformed in 1999 but Paul Ryder left after falling out with his brother, and he did not rejoin until another reunion in 2012.
They have been back on tour recently and were due to headline the Kubix festival in Sunderland on Friday.
Organisers said: "Following the tragic news of Paul Ryder passing away this morning, The Happy Mondays will no longer be playing tonight's show and our thoughts remain with the band and Paul's family at this difficult time."
Paul Ryder also acted in films including The Ghosts Of Oxford Street and Losing It, and also made a cameo as a gangster in the film 24 Hour Party People, about the Madchester music scene - and named after a Happy Mondays song.