Jazz Ration App
 'Jazz Ration' is the name of a free web-app that runs on any mobile device with internet connection, that contains a small but essential portion of jazz guitar knowledge. There are chord diagrams for most commonly used jazz chords, and the app provides exclusive access to jazz licks videos and backing tracks.
The Jazz Ration app has been discontinued. Please stay in touch to check how its content will be made available in the near future