Sŵn y Glaw is the name of a house near where I work. Bit depressing, don’t you all think? 
Another one I heard but cannot find is California Dreamin’ redcorded in Cymraeg by Y Nhw "Cwympo Mae Y Dial. I’ve got a low tech recording off Radio Cymru just for myself as I can’t find it anywhere!
EDIT: Just found it on Youtube!!! https://www.youtube.com/watch?v=qmKGjolnHuI
Moving the question in this topic in case someone else would like to join the discussion.
besides @siaronjames and @Hendrik.
I’ve checked songs previews, and my favourite is certainly Alcatraz (playing Bibopalwla’R Delyn Aur).
Does anybody know them?
Then, among those I’ve never heard, I would be curious to hear something else by Estella (onthe comp, playing Dim Ond Cysgodion) and Maharishi.
But with names like these, there’s no way I can reach any results in Welsh from Google, too much other stuff with the same names! 
Also…curious to hear other opinions here. I had kinda missed Meic Stevens singing in English before seeing the documentary.
I know that singing the same song in different languages change a bit because of the sound of the language itself, the metrics and so on.
But is it just my impression or he also changes a lot his singing style in most of his songs in English?!
Maybe it’s also a coincidence cause they accidentally are from a specific period and the music in general have a sound that’s closer to my taste…but anyway, still curious to hear more opinions!
p.s. his Welsh accent is one of my favourites, anyway!
Estella made 2 EP CDs and 1 album - this is the album -
This is the 2nd EP - https://www.ebay.co.uk/itm/Estella-Tan-Welsh-Language-Cd-Estella-Records-2002/264531038346?hash=item3d9747508a:g:IgoAAOSwlj9dwb1y
Oh, and the lead singer of Alcatraz was Cate Timothy aka Cate Le Bon - she does a lot of solo stuff now.
For some reason I had seen the links of the Estella records, but missed the last part of your post.
It’s interesting I picked Alcatraz, even though I totally hadn’t recognized the voice: Cate Le Bon is one of my favourite new Welsh artists!
Personally, I’m glad you picked Estella! Great line-up back then!
Oh!!! 
The other day I had checked and bookmarked the link to Sain page but hadn’t read through the bio…until now!!! 
Hey @gisella-albertini !
You’re so fast at finding things that Probably not even Pat herself has seen it!