It’s a mystery. A beautiful and sweet mystery.
Initially and until a few years ago, he uses his voice for practical reasons to « dress » his compositions with a melody. His left hand devoted exclusively to play the bass line, and his right to the chords, it remains to him only his voice to express and memorise his melodies.
And not least, there is the childhood memory and the continued presence of a small voice deep in his soul that has the desire to give.
Also lets you express it with its own language. Freed of words, it distils all his emotion.