HOZIER has become the latest voice to be added to Dubliner Greg McQuaid's charity single.
The collaborative single was dreamt up by radio DJ McQuaid who hosts a popular morning slot on KFOG FM in San Francisco.
It will be released in time for breast cancer awareness month in October and the KFOG team hope to raise much needed funds for research into the disease.
The song has a working title of 'Boob Spelled Backwards is Boob' which came from Mr McQuaid's co-host's eight-year-old son.
There were no lyrics or melody attached when the project began, but Mr McQuaid has managed to attract some big names to the project.
Irish breakout act Hozier is the latest to add his voice to the single, alongside Florence Welch of Florence and the Machine fame, and '80s' band Spandau Ballet.
The Take Me to Church singerrecorded his segment in the Masonic music venue in the Californian city.
Hozier, from Bray, sang the chorus line 'boob spelled backward is boob".
"We are still hoping for Bono when he is here in May," McQuaid told the Herald from the US.
Having the U2 frontman feature on the track would be fitting as the finished track is likely to resemble the iconic Do They Know it's Christmas?
So far every artist who has sat in the California studio has contributed to the track - some adding melody, some adding guitar and some giving their vocals.
The plan is to ask every artist or band who come through the studios to take part in the project.
Hozier was in California continuing his global festival circuit, where he wowed fans at Coachella before playing the Masonic to a sold-out crowd.
The Bray man's star is continuing to rocket and he is making an impact on the music industry both at home and abroad.
Later this month, he will return home to play Slane Castle alongside the Foo Fighters and the Kaiser Chiefs.
He will also join the line-up at this year's Longitude festival in Marlay Park.
Though he has attracted famous fans in the shape of Adele and Taylor Swift, the 24-year-old admitted this week that he is not used to stardom just yet.
"Being met with squeals and screams, I haven't gotten used to that," he told Rolling Stone magazine.