The 15 Song Album collection:

Welsh title:

01 - Bron-Y-Aur Stomp - Led Zeppelin
02 - Yr Olaf - 9Bach
03 - Carmel - Yr Anhrefn
04 - Aderyn Llwyd - Mary Hopkin
05 - Cymru, Lloegr a Llanrwst - Y Cyrff
06 - Ar Hyd Y Nos - Bryn Terfel
07 - Ar Lan Y Mor - Duffy
08 - Gwyr A Aeth Gatraeth - Test Dept./Brith Gof
09 - Calon Lân - Cerys Mathews
10 - Don't Forget (Welcome To Wrexham) - Jon Hume

[okay, this is arguably inconsistent with the theme. it is, though, the only title I can offer]
 
Welsh title:

01 - Bron-Y-Aur Stomp - Led Zeppelin
02 - Yr Olaf - 9Bach
03 - Carmel - Yr Anhrefn
04 - Aderyn Llwyd - Mary Hopkin
05 - Cymru, Lloegr a Llanrwst - Y Cyrff
06 - Ar Hyd Y Nos - Bryn Terfel
07 - Ar Lan Y Mor - Duffy
08 - Gwyr A Aeth Gatraeth - Test Dept./Brith Gof
09 - Calon Lân - Cerys Mathews
10 - Don't Forget (Welcome to Wrexham) - Jon Hume
11 - Myfanwy - Bryan Terfel
12 - Ty Bach Twt - Cerys Matthews

(Her Hulla Baloo album is all in Welsh. This one is a folksy chant and I have to say is very charming. )
 
Welsh title:

01 - Bron-Y-Aur Stomp - Led Zeppelin
02 - Yr Olaf - 9Bach
03 - Carmel - Yr Anhrefn
04 - Aderyn Llwyd - Mary Hopkin
05 - Cymru, Lloegr a Llanrwst - Y Cyrff
06 - Ar Hyd Y Nos - Bryn Terfel
07 - Ar Lan Y Mor - Duffy
08 - Gwyr A Aeth Gatraeth - Test Dept./Brith Gof
09 - Calon Lân - Cerys Mathews
10 - Don't Forget (Welcome to Wrexham) - Jon Hume
11 - Myfanwy - Bryan Terfel
12 - Ty Bach Twt - Cerys Matthews
13 - Dimbran - Catatonia
14 - Suo Gân - Charlotte Church