It means that to the writer music makes life meaningful and he could not live without it.
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It's from the music video to We're Not Gonna Take It from Twisted Sister
It would make very little difference.
This phrase comes from Shakespeare's Twelfth Night. Duke Orsino is upset that his courtship for the dear Olivia is not going well and asks for an abundance of love so that he will lose his appetite for it. He says:"If music be the food of love, play on,Give me excess of it, that, surfeiting,The appetite may sicken, and so die."It's actually not as happy of a quote as what people think it to be.
I believe this means that music is something good, in something bad. The adjective 'gloomy' that describes night makes you think that night is something to fear, to feel sorrowful when it's near. But the moonlight makes it slightly better, and this shows music being something of great interest in a 'gloomy' life.