Only just starting out as a complete beginner I understand major minor chord structures already but could never connect a to b or why a 7th chord would be needed or even what it was! The jump start course is really showing me the way putting sounds in my hands and ideas in my head. I cannot recommend these course high enough they are presented really well and give you lots to work on to advance your own game. I do own courses from other companies who are equally good but I always think you can never have too much information and this is a top draw addition to my piano journey.