There is a law of physics that states for every action is an opposite and equal reaction if we adapt this law to understand why some of us can only play in one or two keys fluently we will understand that it is because of our behavior and approach what we have done and how we practice shape how we play and approach the instrumentthose of you who can only play in a few keys fluently probably do one or more of the followinguse your transpose button to learn a song in a different keyuse your transpose button when playing in churchuse your transpose button when practicing at homeif you have to learn a song in one of your weak keys you transpose it to a strong key have your teacher teach in your best keysif you have to learn a modulation you pick your starting key so you start and end in a strong key well if you use some simple physics to help you you may find your playing getting stronger and strongertry doing the opposite of what you want and you will get an opposite reaction try to learn songs in your weak keystranspose your strong key moves into your weak keyspractice your progressions in your weak keys instead of your strong onesset your modulations so you end on a weak keyif you start to do these opposite things you will find that you will start getting very different results in your playingthink about it doing what you want to do (the easy thing)gives you the oppoite of what you truly desire (mastery of your instrument)doing what you dont like (the tedious the difficult)gives you ease in playing and performing for every action there is an opposite and equal reaction