Part 5 · Other Styles · Chapter 63
Slow blues is usually written in 12/8: twelve eighth notes per bar, grouped in four beats of three. Count “1 2 3, 2 2 3, 3 2 3, 4 2 3”, or just feel four big beats.
Hi-hat on every eighth, bass drum on beats 1 and 3, snare on beats 2 and 4.
An extra bass drum note leads into beat 3.
Slow blues needs patience. Let each backbeat land a hair late and heavy, and never rush the triplets.