"I always seem to have a vague feeling that he is a Satan among musicians, a fallen angel in the darkness who is perpetually seeking to fight his way back to happiness"

This quote is referring to a musician who is struggling to find joy. The expression "Satan amongst musicians" suggests that this individual is a talented musician, however has actually been corrupted by the darkness of his own emotions. The expression "fallen angel" even more stresses this idea, as it recommends that this individual was once a source of light and joy, but has actually given that been dragged down by his own inner turmoil. The expression "perpetually seeking to eliminate his way back to happiness" suggests that this person is continuously searching for a way to be happy, but is not able to do so. This quote is a powerful reminder that even the most talented individuals can have problem with their own inner demons, which it is important to be understanding and encouraging of those who are having a hard time.