12-Bar Blues Explained

The 12-bar blues progrossion is the foundation of most blues music. It is also used in many other types of music. In other words, this is something you need to learn. 

In these three videos, Adam Gussow explains the progression in a very understandable way. It may take a while to watch all three, but if this is something you don't already know, then it's definitely worth your time.