Rumba columbia is the fast 6/8 rumba from the sugar and dock towns of Matanzas — traditionally a solo men's dance, the dancer duelling with the quinto. It lives on the same timeline as bembé.
How it sits: the clave layer is the five-stroke 6/8 clave (3-2); the bell (guataca or cowbell) plays the seven-stroke 6/8 bell, which is that clave plus two strokes. The catá or guagua — a hollow log struck with sticks, here on rim — keeps a steady x . x x . x figure each bar. The tumbadora (conga-lo) drops its open tones on the fourth dotted-quarter pulse and the eighth after it, the anchor the whole ensemble leans on; the conga-hi line is a fixed stand-in for the quinto, which in real columbia improvises against the dancer.
Listen for the bell's long–long–short–long–long–long–long shape and feel it in four dotted-quarter beats; the low drum on beat 4 is the downbeat-to-come.
Practice: foot on dotted quarters, clap the clave, then sing the bell over it.