The above reference gives:
A EI DI'R DERYN DU

A ei di'r deryn du
To my dearest love?
O cais fy nghangen gu
For I'm so deep in love.
Ni welaf yn un man
Such a damsel in my sight
Â'r ferch mor lân o liw
She is a beauty bright.

Mae'i gwallt yn felyn aur
Just like a ring of gold
A'i phryd fel eira gwyn
The truth it must be told.

One might expect the alternate English/Welsh lines to be a translation, but this is clearly not the case. My translation would be extremely slow, but the first line would appear to be "I sent a blackbird"

As with Mary Humphries' comments above, this would appear to be another 'blackbird' song, also sourced from 'Barry' (T)

Nigel