Might try www.loudcity.com I like their Search feature, you can find stations that play what you are looking for very easily, and it's all free as far as I know. Some may ask for contributions. (No affiliation.)

Probably can do the same on myradiomix.com too I haven't spent any time with it, first time I heard of it is today in your post.

www.theradio.com

I love their Dub, and 1950s Soul sections.