If your fingers don’t already know the MVP for piano, this right here, this is it. A minute to learn, a lifetime to master, this little bit of judo exerts the maximum force for the minimum amount of energy. Straight out of Miles Davis All Blues, this little 6/4 inversion is a great way to play a G7 chord. Change one note and it may look like a G minor, but it’s working like a C7.
Next up, train your ears to hear what your fingers can do easily. If you don’t hear those inner voices, you’re missing a lot of opportunity for harmony. Practice making them stand out by moving them around a little bit, and then you can sing along.