Unit 12 starts to really combine what students know about music theory (and how it looks/is written) with what they hear.
This unit is more of a how-to rather than a lecture where you have the kids take lots of notes. I'll explain the concept, process, and suggestions for being successful at rhythmic dictation; I also introduce rhythmic error detection (where a student has a handout of a rhythm but what's played has an error; effectively making them find the correction and update it) and melodic dictation, where students will have to decipher the played pitches and rhythm.
Look for the Unit 12 handout on rhythmic dictation (teacher copy and student copy) so that you can demonstrate how this works with the kids. It's fun, it's challenging, and it's a lot simpler than you realize!