For all musicians instrumentalists and vocalists regardless of ability. Use for individual or group playing and practicing. If you use this volume in conjunction with Volume 1 you will have a solid foundation from which to meet any new challenge yo u may encounter. This set will quickly change the practice habits of many musicians instrumentalists as well as vocalists. It covers (all 12 keys) major minor (dorian harmonic and melodic) dominant 7th half diminished lydian and sus.4.