Twenty choirs, five categories but only one prize. Over the next six weeks, S4C will be home to the Côr Cymru 2015 competition. The competition is held every other year, and Heledd Cynwal and Morgan Jones will guide us through the preliminary rounds as choirs compete for a place in the final on the weekend of 18-19 April.
Since launching the competition in 2003, four choirs have been crowned champions and it's now one of the highlights in the Welsh competitive singing calendar. The choirs are divided into five categories: male voice choirs, women's choirs, mixed choirs, youth choirs and children's choirs.
Also, for the first time, primary school choirs will compete in a special one-off programme, Côr Cymru Cynradd.
The choirs taking part in the youth choir category are Côr Aelwyd JMJ Bangor, Côr y Cwm (Rhondda Valley), Ysgol Glanaethwy Senior Choir and Ysgol Gerdd Ceredigion.
The male voice choirs taking part will be Bois Ceredigion, Cantorion Colin Jones (Wrexham), Bechgyn Bro Taf (Cardiff), and Rhosllannerchrugog Male Voice Choir.
The women's choirs taking part are Côr Merched Sir Gâr, Llunsain (London) Parti Llwchwr and Waun Ddyfal Women's Choir (Cardiff).
The children's choirs in this year's competition are Côr Cytgan Clwyd, Côr Heol y March (Cowbridge), Ysgol Glanaethwy Junior Choir and Anglesey Youth Choir.
And the mixed choirs will be Cywair (Ceredigion), Côr Crymych a'r Cylch, Tempus (Haverfordwest) and Côr Aethwy.
The primary school choirs will compete in a separate programme to be broadcast on the big weekend. They are Llangennech Juniors Choir, Ysgol Gymraeg Teilo Sant Choir (Llandeilo), Côr Ysgol y Wern (Llanishen, Cardiff) and Ysgol Iolo Morganwg Choir (Cowbridge).
Two prizes are awarded on the night of the grand final – one prize is awarded by the judges whilst the other is decided through the home viewers' televote.
The competition will be held at Aberystwyth Arts Centre.