All Levels. Fun and Educational. Explores in detail the fundamentals of playing Rhythm (I Got Rhythm) changes in all keys. For decades , jazz greats have used these progressions as springboards to newinterpretations and improvisations. Charlie Parker practiced I Got Rhythm in all twelve keys and recorded these progressions on 28 seperate occasions. All 12 keys include a written melody as well asa solo section. Special section contains uniquely designed slow recorded tracks.