Dub is a music genre that grew out of Reggae. Reggae is a really popular music genre created in the 60s and so is Dub. Dub is considered to be the first ever genre of remixes. It’s considered a subgenre and that explains the unpopularity of Dub. The community of both genres is very friendly and so are the writers of both genres. Instead of competing , the creators instead collaborate to make songs together. I personally really like Dub as a music genre for just chilling.
Here are some examples: https://www.youtube.com/watch?v=-GhmDgMw8jI
Also there is a channel that has many mixtapes with dub music it is called stand high patrol: https://www.youtube.com/user/STANDHIGHPATROL