Christy Moore's Oxegen appearance with headliners Coldplay has resulted in worldwide interest in the legendary folk singer.
"The reaction has been just incredible," a source close to the singer said last night.
"We could never have foreseen something like this. Christy already had an international profile but this really is on a different scale."
The former Moving Hearts singer's appearance with Coldplay on the main stage had been kept a closely guarded secret throughout the three-day music festival.
In order to keep word from getting out, Coldplay had asked Moore, who is originally from Newbridge, to rehearse the Jimmy McCarthy-penned tune in private in their dressing rooms at Punchestown prior to the show rather than at a sound check.
"Coldplay have invited me to sing a song with them in my native place," the singer wrote on his website shortly after.
"These are the fields I roamed as a boy. Just had a rehearsal with Will, Chris, Jonny and Guy. We had such a nice time that we rehearsed the song twice!
"I welcome Coldplay to the Short Grass County. May their spirit and generosity stay with us as they continue on their way."
A source close to Christy added: "Coldplay really did their homework. They knew exactly what way they wanted it performed and had all the parts worked out for the different musicians in the band."
Despite this, thousands of fans heard Chris Martin starting one verse of the song too early.
The mistake reduced him to fits of laughter, but Moore carried on without him.
However, the next day Moore was happy enough with the performance to describe the duet as a "grand outing".
Described by Coldplay as one of their "all-time favourite singers", the link between Moore and the UK band started through drummer Will Champion.
Champion's relatives hail from Galway and he has been a long-time fan of Moore's work.
The former Planxty member is reported to have visited Coldplay's London studio on occasion and, in 2004 when Moore was presented with an IRMA Honour, Irish Recorded Music Association's supreme award, Coldplay were among the big names who sent a message of congratulations.
It is understood the legendary singer has decided his appearance at Oxegen is the perfect point to take a break after putting on regular shows in the first half of the year.