His band Interference announced the sad news in a post on Facebook.com on Tuesday (02Feb16).

His bandmates plan to release "a full statement" in the coming days, adding, "We'd ask that the family be allowed privacy at this incredibly difficult time".

A cause of death has yet to be revealed, but the singer had been diagnosed with Muscular Dystrophy.

O'Farrell co-founded Interference in 1984 with guitarist James O’Leary after a meeting at Clongowes Wood College in County Kildare. They gained popularity in their native Ireland, and earned widespread praise for their performances on network RTE2's music series Other Voices.

The band was best known for the track Gold, which featured in movie musical Once. The song was also used in the stage adaptation of the show.

Once star Glen Hansard took to Twitter.com to share his condolences, writing, "Fergus O'Farrell, A true artist and Hero of mine passed today." The actor and musician also quoted a lyric from Gold, adding, "And I loved him so...".

Throughout his career, O'Farrell collaborated with top Irish stars, including Hansard, Gavin Friday, Maria Doyle Kennedy and late singer/songwriter Black, real name Colin Vearncombe, who passed away last week (26Jan16) after suffering head injuries in a car crash.