Easiest and fastest way to personalize any hymn

Helping you realize that you don't need CRAZY wild music-neard smarts to create wonderful music is one of my missions. Truly, if you can PLAY hymns, you can REHARMNOIZE and personalize hymns. It's very true. And there are some very easy ways to start. You don't need a music degree. You don't need any voice-leading knowledge. You don't even need to know Roman numerals or inversions or any other seemingly overcomplicated music theory stuff. It reminds me of a video I saw of Paul McCartney...