just hoping someone can help identify a Welsh LP ?

About 10 years ago me and the mrs were sorting through a job lot of Welsh language 'folk' EPs
in a music collectors used record shop.
when we noticed a 12" LP displayed on the wall with a price tag of £30.

The shop owner played a few tracks and it was brilliant
but we couldn't afford it.

When we went back a few weeks later the shop had closed down
and we lost the chance to even offer to pay a fiver or so for a tape copy.

So, if we remember correctly it was an LP by a Welsh language female singer;
approx late 1960s/early 70s,
slightly acid rock sound with, if we remember correctly, prominent electric organ.

She had a fantastic soulful voice.

anyone remember her ????