Nick Cave said this quote

The boy will grow older, and over time there will be other songs – not many – ten or maybe twenty in a lifespan, that stand apar from the rest of the music he will discover. He will realise as he grows older still, and crosses the Canadian border and drives down into Seattle, that not only are these songs holy or sacred, they are hiding songs – what the Aztec Indians call carrion songs – that deal exclusively in darkness, obfuscation, concealment and secrecy. He will realize that, for him, the purpose of these songs has been to shut off the sun, to draw a long shadow down and protect him from the corrosive glare of the world.