"Howard Neil" wrote

By the way, Y Mynydd Du is pronounced "er minith dee" the "th" being as
in "the" rather than in "think".

Close. Try 'muh-nith dee'. You're right about the hard sounding
'th' though.

Have a listen to Cefn Gwlad next Wednesday, S4C, 9.0pm.

If you can't agree on the Welsh pronunciation you could always stick to the
English. One world, one language, far simpler.