How can I create a background beat in Minecraft using redstone repeaters?

At least, I think you need to use redstone repeater. I just want a description outlining how to create a simple, repeating note (Tap pause tap pause tap). Once I learn the basics, I can go on to create a more advanced beat. I just want to know this because I’m building a music studio in spawn town on the fluther server, and a background beat would be a nice touch.