Bassist Paul, 58, passed away just before the band was due to play the Kubix Festival in Sunderland.
A week ago the Happy Mondays released a charity EP in Paul's (nicknamed Horse) honour and brother Shaun said: "This special release of Tart Tart showcases the unique musical talent of our brother Paul Ryder who passed from this world ...
The band - which originally was made up of Paul, Shaun, Gary Whelan on drums, Paul Davis on keyboard and Mark ‘Bez’ Day on guitar - wrote in a Facebook post: “The Ryder family and Happy Mondays band members are deeply saddened and shocked to say that Paul Ryder passed away this morning