So there will come a time when you will need to change the key of a song you are playing to suit yourself or someone else you are playing with. I know as a singer I have my favorite keys that suit my voice. I just can't sing in some keys. So there will come a time when you will need to change they key of a song you are playing to suit yourself or someone else you are playing with. It can be daunting, but it is actually super simple with this technique. | Pianote