Dozenz is a rap video community.

You sing a rap 2 bars long and post it.
When you post in reply to someone else's rap, your rap will become the next verse in their rap.
As many people's replies join together, they form a large cypher.
If the same people repeatedly reply to each other, it might even become a rap battle.

It's really simple to do.
Let's express the various moments in daily life through rap.