I'm a gospel, hip hop, and R&B producer here in Long Beach, Ca and I have to tell you that "Gospel Keys" is the business. It helped me all the way down to the last note in playing by ear and different types of chord progressions. don't get me wrong, I've been playing keys for 22 years but these tools are a must have for anybody who is serious in playing the piano/keyboard. Mr. Jermaine Griggs, you are a true blessing to this industry. Keep it up brother. You will continue to be richly blessed!