Aye they are. In fact many good songs sung by many excellent performers would suffer if clear diction was a prerequisite.

I just get the feeling that some posts here are arguing that folk rock is different to folk as appreciation of lyrics is something that sets the genres apart. I would argue that is a sweeping generalisation that doesn't do justice to the art of using voice as an instrument, which is widespread amongst just about all types of music.

Fol de rol day