Today Mark was teaching and decided he wanted to clean up Shinnen, so in the process I ended up learning the rest. So I just barely know Shinnen now too (can't quite play it perfectly yet), along with Hiryu! That means I picked up two songs in the last month by the skin of my teeth along with the song that was actually taught. For me, who is often very slow memorizing things, this is amazing!
I think that coolest things was being able to play line C, for the first time, almost completely correctly just by hearing it a whole bunch of times.
That and the first time I did the Hiryu rotation around the drum correctly, I was amazed it just clicked and suddenly I could just do it.