Chapter 06 of VJ Manzo's book Max/MSP/Jitter for Music is about Data Structures. More specifically, it's about generating random MIDI notes and using filters based on modalities or diagrams to select particular notes to play. The modalities are selected using VJ's excellent modal object from his EAMIR package and the diagrams are drawn by hand in the table object. Either way they provide interesting ways to create generative music that actually sounds like something. I think of this as having particular use in a movement-driven sequence in my upcoming dance piece, where we will follow the performers' movements with a Kinect, a little bit like a full-body version of the NodeBeat app, which I love.