Question

Is there such thing called a catchy and fast rhythm or is it a catchy and fast beat ???

Answer 1

Both actually. There is a thing called a catchy and a fast rhythm and a fast beat.

Answer 2

In music the beat always determines what kind of s song it will be. like songs with a backbeat tend to be rock or hip hop or something and end up more popular while songs without one tend to be more like classical. so yes it's the beat