I agree with Ocean. The way Enka is perceived in Japan is somewhat similar to that of C&W in USA. I used to hate Enka when I was younger but now that I am older, I GET it.
Like C&W music, where you have your Shania Twains, Gretchen Wilsons and Kenny Chestneys stuffed together in the same bin with your Johnny Cashes, Emmylou Harrises and even Bill Monroes, each Enka singer has a different degree of "Enka-ness" in them.
If you are a newcomer to the wonderful world of Enka, I suggest you start with the traditional, old skool singers from the olden days. That was before they started using synthesizers, rock guitars and western dance rhythms to make it more modern.
I should also add that one can detect a touch of Enka in a lot of today's J-Pop/J-Rock if they listen carefully. The lines between those genres are surprisingly thin and sometimes even intertwined.
To me, it's all 窶ーテ娯?背窶ケテ (Kayoukyoku / Popular music).
ツ