Are you playing two hands, or intend too ?

If so put your two hands on a keyboard. Let’s pick a key other than C major. OK - A minor then. All white keys again, that’s easy. Now put your left little finger on the lowest A, left thumb the next A up, right thumb on the next A, and right hand little finger on the A above. This is a reasonable position. You’ve just eaten a 49 key keyboard. Let your right hand range two octaves, and you’re at 61.

There is a reason, note wise why a piano has 88 keys, and why they are pitched the way they are.

You can use a strategic split in the middle of a keyboard and get by with 49. Thirty seven keys works if you simplify things down particularly with you right hand, and/or shift pitch on the keyboard, with music that doesn’t range around.

This is all just my perspective on things though, others here will have a different perspective.

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