Watch the Sweet 16 Solo 2 online guitar lesson by Chris Buono from Guitar Lab: Blues Soloing

The 16 bar setup in this set of changes is pretty much a basic 12-bar with bars 11-12 "tagged" (repeated or added) two times more before going to the final two bars of the I chord. It is at these points you should take notice how the simple idea of repetition coupled with melodic development is employed to best make this alternate bar count flow like a conventional 12-bar. In all three instances you have a lick idea stated in bars 9-10, then repeated in bars 11-12, albeit with slight phrasing variation for color and then finally a closing idea in bars 13-14 that nicely sets up a resolving idea in bars 15-16.