Clannad are to reform for three performances in Dublin's Christ Church Cathedral before recording a new album.
The Grammy award-winning line-up will get back together for TradFest, a five-day traditional music festival in Dublin later this month.
Musician Pol Brennan revealed he will officially reunite with siblings Moya and Ciaran and uncles Padraig and Noel Duggan for a series of gigs for first time in two decades.
"It feels very, very good to be back," said Pol. "It feels like some stuff was left undone after I left over 20 years ago."
Clannad achieved huge international success over their 40-year career, with their unique voice and Celtic traditional music selling more than 10 million albums worldwide.
Pol, who has performed at a handful of live gigs since his departure in 1989, revealed he and Ciaran have already written five tracks for a new album which they plan to record in April and May before touring the summer festivals. Enya will not be joining the group.
But their haunting sounds will fill Christ Church Cathedral when they perform on January 27, 28 and 29 during TradFest.
Vocalist Moya Brennan said: "Christ Church is so fitting with its sounds and ambience for the performance. It's a very special place to play."
Other highlights of the festival include Altan celebrating its 25th anniversary with a special concert featuring guests, including Eddi Reader, in Christ Church; outdoor gigs in East Essex Street from acts such as the Furey Brothers, Mike Hanrahan and Eleanor Shanley; and a showcase of up-and-coming groups including Beoga and Ciorras.
TradFest will also go global this year with performances streamed live on the internet on www.LiveTrad.com.