This set of Cycling ’74 tutorial videos tackle getting started with Max/MSP.
Max is an interactive graphical programming environment for music, audio, and media.
Max is the graphical programming environment that provides user interface, timing, communications, and MIDI support. MSP adds on real-time audio synthesis and DSP. Jitter extends Max with video and matrix data processing, and Vizzie is a set of modules for quick and unique video creation.