While not a group, a modern singer in this kind of style I really like is Aurora. She is Norwegian, so she does have an accent but definitely not what I'd describe as the signature "yowl" we're referencing here. She also falls into a category closer to pop than folk generally speaking.

https://www.youtube.com/watch?v=jTwdGRHl5Mw

As for Amy Winehouse - I can definitely understanding someone finding her voice annoying, but I actually really like it for the same reason mentioned above: it sounds really unique and fresh to me.


Cheers,
Deryk