One Day

Am I limited with writing
Like I am with the piano?
In the Piano, I cannot play
All the scales, nor transition
Into new movements.
My piano playing is derivative.
My notes are true;
My rhythm is succinct and on time;
Yet, am I, like with my music,
Unable to play in different scales?
Limited to a few Jazz Chords
And the same basic scaled melody?
I struggle to invent new songs
Because I don't understand melody;
It is foreign to my brain.
I cannot create melody
Because I cannot understand how.
I can appreciate it in music;
I crave it in what I listen to. But, I cannot form a melody.
I cannot play in different scales;
Only C Major, A Minor, C Minor and D Minor.
I have a basic understanding of chord progression;
But, I simply do not understand melody.
I cannot understand melody.
Is it also so with the profession I chose?