Also worth checking out is Sam Aaron's current project, Sonic-Pi: http://sonic-pi.net
Sonic-pi (and overtone, which was my first intro to this stuff) is a wonderful piece of creative software on its own, but combined with a human it's really a new form of art.
Pi 2, case, power supply (Adafruit $65 shipped)
8g Micro SD w/ Raspian Linux (spare parts)
Keyboard, Mouse (spare parts)
Speakers or headphones (spare parts)
HDMI, Ethernet cables (spare parts)
Monitor (just used my TV)
You can also run Sonic-Pi on a PC/Mac, which would let some kids continue their explorations outside of the lab."The shadowy DJ sets, knob-tweaking noise and fogbank ambient of many Moogfest performers was completely demystified and turned into simple numbers and letters that you could see in action. Dubbed "the live coding synth for everyone," it truly seemed less like a performance and more like an invitation to code your own adventure."
http://www.rollingstone.com/music/live-reviews/moogfest-2016...