Finger independence is so important on the organ. If you’ve ever tackled a Bach fugue, or transcribed a Jimmy Smith jazz organ solo, you’ll immediately see why.
Before tackling this Goldberg variation, your chops better be in amazing shape:
You have to have strong, agile, independent fingers. I first learned this when I started to tackle jazz improvisation. I think a good keyboardist needs to practice all types of scales and arpeggios. But another ingredient is being able to make your fingers move in odd, independent ways; at least odd from the perspective of switching to keyboard after playing bass for many years.
Thankfully, there’s Dohnanyi’s Essential Finger Exercises book:
Get ready to get your butt kicked old-school. As a beginning keyboard player, this book was really tough. Exercises 1-10 contain the bulk of this books message, which is essentially “Get ready for your hands to be very sore.”
I recommend you spend the ten bucks and buy this book.