I know how the typical I-IV-V progression works, and I know the scales (well not by heart but more or less), there's one thing that always gets me, though. How is the bridge constructed? I mean the one that you can hear in Pride and Joy at 0:28 and through the whole song. It's very common and can be heard in almost any blues standard, but instead of learning each one by tabs I'd like to understand how it's played, depending on the key in which the song is played. Is there a general rule to it?
P.S: please excuse my limited knowledge of music theory, I'm a newbie.
Ok I might have gotten the name of this riff wrong (as in it's not a bridge, but a turnaround), and I think the best I can do is just provide an example of a more standard song. Like Key to the Highway, you can hear it at 0:20 for two bars. I mean only that 2 bar long part, I really love that lick.