“A painter paints his pictures on canvas. But musicians paint their pictures on silence. We provide the music, and you provide the silence.” - Leopold Stokowski
I think that music is in itself just undifferentiated emotion. Emotion waiting to be labeled.
Songwriters find it on accident sometimes, like buried treasure. The right melody or combination of chords stumbles out of their mouth or hands, and there it is: an emotion. Happiness. Sadness. Regret. Hope.
A good songwriter can get onto it like a surfer clumsily riding a wave. He or she knows where it is, can find it, and can even manage to tame it sometimes by attaching their message to it.
GREAT songwriters knows how to make it. They know what they want to express, and then they do so.
That's my greatest dream and goal.