A 1,000 voice choir has been recruited by the WRU to envelop the Millennium Stadium in song when Wales face the Barbarians on Saturday, 2 June (KO 2pm).
The choristers will raise the decibels at the summer rugby international with some of the all time favourite music which has featured in the history of the game in Wales.
The celebration is planned for the final match on home soil before the Wales' team that face the Baa-Baas leave for their three-Test, four-match, tour of Australia.
The choir will assemble in the north stand of the stadium where they will be conducted by the stadium's feature choirmaster, Haydn James, and accompanied by Symphonic Brass Wales.
The choir will unveil a medley of songs which Haydn James is preparing to honour the countries represented by the players in the Barbarian line-up.
Fans will be able to hear the massed choir from 1.00pm which is precisely one hour before the kick-off.
Supporters will be encouraged to join in the singing to ensure the capital city echoes to the sound which will boom out across Cardiff.
The massed choir will also strike up during the match to raise the noise level to a massive intensity as the game unfolds.
Alex Luff, who manages pre-match entertainment at the Millennium Stadium, said: "The traditional sound of Welsh rugby will be at its best when Wales face the Barbarians this summer with a 1,000-strong choir booked to boost the decibels at the Millennium Stadium.
"Welsh rugby fans are renowned for their passionate singing when Wales take on the opposition at the home of Welsh sport and we are expecting an extra special sound for the final home clash before Wales embark on their tour of Australia."
Tickets priced from £25 for adults and £10 for under 16s can be purchased online at www.wru.co.uk/tickets or by calling the ticket hotline 08442 777 888 or Ticketline on 02920 230130.
The full list of choirs is as follows:
Cwmbrân Male Choir, Cor Meibion Taf, Beaufort MVC, Caldicot MVC, Aber Valley MVC, Bridgend Male Choir, Gwalia Male Choir, Treorchy Male Choir, Cwmbach MVC, Dowlais Male Choir, Cambrian Male Choir, Cor Meibion Abercynon, Cor Meibion Morlais, Cardigan Rugby MVC, Cowbridge MVC, Neath MVC, Kenfig Hill MVC, Cor Meibion De Cymru, Cor Meibion Dyffryn Aman, Pendyrus Male Choir, Llanelli MVC, Morriston RFC MVC, Glyneath MVC, Treharris MVC
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.