Their two most well known songs (off a best of welsh compilation I borrowed off a friend)
Y Teimlad (this was covered by the Super Furry Animals) - http://download.yousendit.com/21B658394DE11444
Casserole Efeilliaid - http://download.yousendit.com/1F80CCA40102DE8F
Some of my own favourites
From their album Pyst (post)
Ben Bore- http://download.yousendit.com/B0F7A13E6DBFE127
Dymuniadau Da- http://download.yousendit.com/67D6A8191C6DB23B
Nofel o'r Hofel- http://download.yousendit.com/5B4D5E8D7D969C98
From the John Peel Sessions album:
Fanzine Ynfytyn- http://download.yousendit.com/7F2C47E414BBB04A
Slebog Bwydeg- http://download.yousendit.com/6512F63F7CB48796
I didn't have their two other albums Wyau (eggs) and Libertino to hand.
The links will all work from 7 days from posting. After that you won't be able to download the songs.
The website http://www.datblygu.com/ is all in welsh, but the good old BBC has information in English as well http://www.bbc.co.uk/wales/music/sites/datblygu/