Is it possible that composers of wonderful music are simply used by God to give His music to the world?
God has way more beautiful music and he doesn't need humans to give his music to the world.
In fact within nature and the vast space of the cosmos music exists. Jewish Sources teach that the entire galaxies and stars ride on waves of music, and that the Stars and the planets sing such beautiful music, that if us humans could have the ability to listen we would be enthralled by its amazing and astonishing beauty. Also remember that the sounds of nature, the waves, the wind, and everything that produces sound within nature, is in fact music.
But I think that God gives certain individuals certain talents that others don't posses, and these individuals Choose from within their human abilities to produce their own unique music. In fact the music that composers compose is entirely human, and has nothing Godly or divine about it.
No composer has ever written a perfect music, and no composer has been able to unite all of humanity for a single purpose to know the Creator of the Universe, the God of Israel. Therefore their music lacks perfection, and that's what makes it human, but the music of God is pure perfection, and if revealed to the ears and minds of the people it can do wonders. Human music is not divine, only God's music is, to attribute divinity to a human being, is a form of idol worship when it comes to Judaism.
It is sad to see sometimes people attribute divinity to people like Beethoven. This composer was in fact the most imperfect subject to human limitations, then any other composer. He suffered from many things, like hearing loss, depression, and he had wild outbursts of anger, pain and other physical problems. His music was just that, not particularly beautiful, but full of his hardships. But God's music is pure, without any blemishes or hardships, his music is not based on personal difficulties in life, sadness, pain, or salvation. His music is the most perfect, divine, and Godly music in the universe, absolute pureness and perfection.
Regards,
Saul