This is a widely used idiom for 'folk music'. Also 'canu gwlad' is an idiom for 'American country music'.

Remember 'canu' is also to 'play' an instrument eg canu gitâr, canu piano etc.

canu means 'singing, to sing' but is is also used for 'playing, to play' when a musical instrument is played - mae hi'n canu gitar 'she is playing the guitar'.

So 'canu gwerin' means 'folk singing/playing' , which is usually translated into English as 'folk music'. A lot depends on context though, and you can always add other words into a phrase to make it more specific:

• Wyt ti'n hoffi canu caneuon gwerin? - Do you like singing folk songs?
• Wyt ti'n hoffi canu cerddoriaeth werin? - Do you like playing folk music?
• Wyt ti'n hoffi gwrando ar ganeuon gwerin?