Hi Joseph. I enjoy listening to Welsh hymns too, because my uncle sings in a Welsh male voice choir so I grew up listening to their recordings which obviously included a lot of hymns. I’m not a religious person, but there is certainly something about those old hymns. I can see why people would not recommend using them to learn the language, but if you like listening to them anyway then they can only add to your understanding, I’m sure. Yes, the spoken language might be different, but I have found that they help me remember vocabulary even if they don’t help me form sentences. I discovered ‘clean’ and ‘blood’ from Y Gwahoddiad, for example. And like Pererin (which is a name I actually understand from having listened to hymns), it has often helped my pronunciation too.
You can buy and download music from Amazon - I remember seeing various versions of Gwahoddiad on there a while back. If they are still doing free trials of Amazon Prime, you can get temporary access to these and others for free.
Carole 