Based on our experience and learning theory best practices, we've purposely designed the material to come in waves each week.  This has been proven to dramatically improve the transformation of all teaching fellows.  There's a ton of deep work and thinking along the way.  

By the way, we recommend this with your students as well. Don't let them go past the first song, until they have mastered it.  We usually use a binder clip or tape to close off the rest of the book until they have proven they are ready.  It also gives them something of a surprise - something new to look forward to.  As per the 80/20 principle.