Almost all the music we hear is built on the foundation of a beat. A music's beat helps us to measure out how long or short sounds in the music should be and how they should be arranged.
Even when music is slow and it isn't always obvious, there will normally still beat ticking along under the music. Beats tend to be regular and steady even when the music sounds uneven and irregular.
In this video, we have a go at measuring some different beats.